Diffraction grating questions and answers.
Advanced Physics questions and answers; Problem 22.
Diffraction grating questions and answers 020The answer is NOT: 9. 0 There are 2 steps to solve this one. A diffraction grating has 600 rulings / mm. Answers within 5% of the true answer will be considered correct. Both gratings must also give second order maxima. 90 O 0. Question: What is a diffraction grating? Answer: A diffraction grating is an optical component with a periodic structure, which splits and diffracts light into several beams traveling in different directions. Please rate if you find this resource useful. Part Question: A diffraction grating having 570 lines/mm diffracts visible light at 34. wavelength of red light of 6×10-7 m the separation of the tracks, d, can be calculated. A diffraction grating can be manufactured by carving glass with a sharp tool in a large number of precisely positioned parallel lines, with untouched regions acting like slits (Figure \(\PageIndex{2}\)). The grating spacing is not known, but a light of a known wavelength of 632. A typical grating quotes the number of lines per centimeter (or per millimeter, or per inch). See Answer See Answer See Answer done loading Question: A diffraction grating with 390 lines per millimeter produces a visible spectrum angular width of 27. (a) Identify which of the following colors (wavelengths) can be observed in the third-order diffraction by calculating the angles at which they can be observed: 14 = 750 nm; 12 = 700 nm; 13 = 650 nm 14 = 600 nm; As = 560 nm; 16 = 500 nm; and Az = 450 nm. There are 2 steps to solve this one. A diffraction grating having 5 7 0 lines / mm diffracts visible light at 3 4 . 67x10^-6 m. Advanced Physics questions and answers; PHYS 2092_Lab 8_Instructions. Starting at the light inlet slit and going outward, what colors do you see in the spectrum? List them all. What is the angle between the first-order maxima for red light ( λ = 680 nm) and blue light (λ = 410 nm )? Physics questions and answers; A diffraction grating with 610 lines per mm is illuminated with light of wavelength 500nm . 9° in the second order. See Answer See Answer See Answer done loading Question: A diffraction grating is 2. 3 Diffraction gratings A diffraction grating consists of multiple slits through which light can pass. Question: Learning Goal: Grating (also called diffraction grating) A diffraction grating has a large number of very narrow slits that are very closely separated. (3) This set of Engineering Physics Multiple Choice Questions & Answers (MCQs) focuses on “Fraunhofer Diffraction”. Value for θ1: 0. Describe how the diffraction grating is used and the measurements that should be taken. After mounting the diffraction grating, look through your spectroscope and record what you see across the back of your spectroscope. Advanced Physics questions and answers; Problem 22. 50cm wide and contains 2100 lines, When used with light of a certain wavelength, a third-order maximum is formed at an angle of 20,0°. Q7 Use the equation λ = Mark schemes A [1] 1 C [1] 2 A [1] 3 B [1] 4 sinθ = nλ/d in this form/correct calculations of d/d = 1/300 C1 substitutes correctly – condone powers of 10 C1 18. 15ms-1 Engineering Physics Questions and Answers – Interference of Light ; Engineering Physics Questions and Answers – Fresnel Diffraction ; Engineering Physics Questions and Answers – Plane Diffraction Grating ; Engineering Physics Questions and Answers – Young’s Experiment ; Class 12 Physics MCQ – Interference of Light Waves and Young Question 3: A diffraction grating has slit separation of 2. (b) Calculate the smallest difference in nm) in wavelengths surrounding 535 nm that can be resolved in the first-order diffraction pattern. b. What is diffraction? Bending of light and its enter into the region of geometrical shadow of an object is called diffraction. How does a diffraction grating work? 1. 2\deg . 90 × 10 5 lines per m. Table 1 shows the diffracting angles measured from the normal for the visible spectral orders using the grating. ) first order second order third order fourth order Submit Request Answer Provide Feedback Physics questions and answers; a diffraction grating has a third-order resolving power of 1,220. At what angle(s) will the diffraction spots (maxima) occur? Use (d) The diffraction grating used to obtain the spectrum of star X had 300 slits per mm. Calculate the distance d between 2. 9 nm onto a diffraction grating. (It is not 0. Physics questions and answers (13\%) Problem 2: A diffraction grating with n=2. Physics questions and answers; A laser is shone through a diffraction grating and the diffraction pattern is created on a ruler as shown below. 3 Diffraction Grating Spectrum Formation of Spectra Observing Grating Spectra 11. What is the wavelength of the light? 138 nm 917 nm 147 nm 183 nm 758 nm 367 nm 637 nm Engineering Physics Questions and Answers – Fraunhofer Diffraction ; Engineering Physics Questions and Answers – Diffraction of Light ; Wireless & Mobile Communications Questions & Answers – Diffraction ; Engineering Physics Questions and Answers – Plane Diffraction Grating ; Class 12 Physics MCQ – Wave Optics – Diffraction Physics questions and answers; Problem 5: The figure shows a diffraction grating with slit separation d and a screen placed a distance x from the grating. Diffractions are of two types, namely a) Fresnel’s diffraction and b) Fraunhoffer diffraction May 24, 2024 · The dispersive power of a diffraction grating is defined as the rate of change of the angle of diffraction with the wavelength of lite. See Answer See Answer See Answer done loading Question: For a diffraction grating with 1600 blazes/mm, what wavelength would you get for an angle of incidence of 30 degrees and reflection angle of 7 degrees? Question: Learning Goal: Grating (also called diffraction grating) A diffraction grating has a large number of very narrow slits that are very closely separated. ) between the first and second order maxima of the yellow light? - 1 attachment 2nd order yellow 1st order yellow light of wavelength grating 600 nm O A. What is. Physics questions and answers; A diffraction grating is to be used to find the wavelength of the emission spectrum of a gas. Figure 1. Part A. Etching in integrated circuits can be done to a resolution of 50 nm, so slit separations of 400 nm are at the limit of what we can do today. Physics questions and answers; A diffraction grating has 650 slits/mm. B. 50 cm wide and contains 3800 lines. A viewing screen is 100 cm behind the grating. The grating has a slit separation of 2. Figure 2 @TOPhysicsTutor facebook/TheOnlinePhysicsTutor (i) Show that the angle of the first order image measured from the straight through position is approximately 3°. Find the value of the wavelength of the second color λ2 in nm. This type of grating can be photographically mass produced rather cheaply. 8. Question: Diffraction grating #1 has half the lines/cm that diffraction grating #2 does. The center dot is the zeroth order and the dots on either side of the center dot are the first order. Part A What is the angle of the second-order maximum? Express your answer with the appropriate units. A musical instrument used to direct soundb. Page 4 | 25 Waves Answers Stationary Waves 1 8. θ is the angle of diffraction of the light of order n from the normal as it leaves the diffraction grating (°) Chemistry questions and answers; 4. Young’s Slits and Diffraction Grating 9 Olympiad Question 20 Answers 23 . a) What is the highest order of diffraction that could be observed with this grating? b) What would be the highest order if there were 6630 lines per centimeter? Advanced Physics questions and answers; A laser is incident on a diffraction grating and the diffraction pattern is displayed on a screen. 50 {m}$ from the grating. Mar 21, 2024 · Without more information on your experimental setup and the exact type of grating used, it is difficult to know exactly why. Physics questions and answers; A diffraction grating has a fourth-order resolving power of 1,260. . DIFFRACTION GRATING AIM: To determine the wavelength of light using a diffraction grating. 17. The interference pattern is collected on a distant flat screen, and all the colors of the rainbow can be observed in the pattern. Light of wavelength 557 nm is incident perpendicularly on the grating. The advantage of using multiple slits is that the bright fringes are narrower and brighter. When used with light of a certain wavelength, a third-order maximum is formed at an angle of 18. 0 m from the double slit. 00 um What is the angular separation (0:- 2. Frequently asked questions and answers of Diffraction Grating in Optics of Physics to enhance your skills, knowledge on the selected topic. 1 d = L = λ 700 nm COLOR Theoretical θ_1 Theoretical θ_1 y_1 y_2 Experimental θ_1 Experimental θ_2 % difference % difference λ 532 nm COLOR Theoretical θ_1 Theoretical θ_1 y_1 y_2 Experimental θ_1 Experimental Question: A diffraction grating with n = 3. e. 15. 9696)Part (b) Find θ2 in radians. It may look like a series of slits but it's more like a bunch of lines carved into glass so that at different points the light sees a different amount of glass and thus different phase. Find step-by-step Physics solutions and your answer to the following textbook question: Light passes through a diffraction grating with a slit spacing of 0. 19. The number of slits in this diffraction grating is too large. 2 Fraunhofer Diffraction from N Identical Slits Intensity Distribution Positions of Principal Maxima Minima and Secondary Maxima Angular Half-Width of Principal Maxima STUDY GUIDE 11. Light from a sodium vapor lamp having a wavelength of 589 nm is incident on the grating. 0 cm from the slit. Answer to A diffraction grating has 45,000 slits/cm. 001 mm. Answer: d Explanation: The expression for the resolving power of a grating is given by: \(\frac{\lambda}{\partial\lambda}\) = nN Hence, it is proportional to the number of slots on the grating and the order of the spectrum. Science; Physics; Physics questions and answers; After a laser shines through the diffraction grating of 3. This set of Class 12 Physics Chapter 10 Multiple Choice Questions & Answers (MCQs) focuses on “Wave Optics – Diffraction”. Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. 10 A diffraction grating produces a first-order maximum at an angle of 17. 5E-05 lines/nm is used to separate two colors of light. (b) Calculate the wavelength in nm of light with a third-order maximum at the same angle 𝜃r2. The angle between their first maxima is Δθ ≡ θ1 - θ2 = 0. This is an unreasonably large telescope. The first bright fringe of a diffraction grating of 600 ruling/mm is found at the angle the adjacent rulings. The distance from the diffraction grating to the LDR is 265 mm. Jun 17, 2024 · This would lead to a different diffraction pattern being observed on the grating, with distinct spectral lines corresponding to the mercury emission spectrum instead of sodium. this is q 7, i just need the top answered (A diffraction grating with d = 2000 nm is used with a mercury discharge tube. Physics questions and answers; A beam of sunlight strikes a diffraction grating with an unknown slit spacing. 9° Physics questions and answers; A different diffraction grating apparatus has a line density of 18,000 lines per centimetre. If the angular position of the second-order bright bands is 45°, what is the wavelength of the light (in nm)? A diffraction grating has 500 lines/mm. 6m Answer to A diffraction grating has a diffraction grating. This set of Engineering Physics Multiple Choice Questions & Answers (MCQs) focuses on “Plane Diffraction Grating”. What is the order of the spectrum? Science; Physics; Physics questions and answers; A diffraction grating experiment is set up as shown below using yellow light of wavelength 600 nm. Spectrometer Grating Viva Questions and Answers Frequently asked questions and answers of Spectrometer Grating in Optics of Physics to enhance your skills, knowledge on the selected topic. 0-cm-wide diffraction grating has 2000 slits. A diffraction grating produces very sharp bright fringes or spots which are called maxima. Light of the wavelength to be measured is deflected by 29. A very wide viewing screen is 2. Engineering Physics Questions and Answers – Diffraction of Light ; Engineering Physics Questions and Answers – Plane Diffraction Grating ; Engineering Physics Questions and Answers – Young’s Experiment ; Engineering Physics Questions and Answers – Lenses – 2 ; Class 12 Physics MCQ – Interference of Light Waves and Young’s See Answer See Answer See Answer done loading Question: A diffraction grating is 2. Secondary Objective Verify the wavelength of the laser light using the data collected from the interference pattern produced when a light passes through a diffraction grating. The slit separation is 500 times greater than the line spacing of the grating. 0°. APPARATUS: Light source, optical bench, and optics kit containing single slits, diffraction grating, and other accessories, THEORY: The principle maxima (bright spots in this case) of the diffraction pattern formed when light is sent through a diffraction grating is given by: ml = dsine -(1) tant = --(2 Advanced Physics questions and answers; What is a diffraction grating?a. The angle between their first maxima is Δθ ≡ θ1 - θ2 = 0. If it is illuminated by a laser at 532 nm, how many bright spots will be observed on a screen placed behind the grating? 3 4 5 Question: Problem 6: A diffraction grating has 2000 lines per centimeter. Mar 29, 2018 · A diffraction grating is a device with a spatially varying phase. 31° A diffraction grating has 2300 lines/cm . The tracks on a CD are like the slits on a diffraction grating. Using the diffraction grating, yellow light of the first order is seen at 30° to the normal to the grating. 15 degrees, and the first light has wavelength λ1=496 nm. 9º. Science; Physics; Physics questions and answers; When a diffraction grating having 6200 lines/cm is illuminated by monochromatic light, the angle between the central maximum and the 2nd order maximum is 46. [2 marks] Questions and model answers on 8. CONCEPT: Diffraction of light: The spreading of light waves around any obstacle is called diffraction. B U mi T o Word(s) 5. Science; Advanced Physics; Advanced Physics questions and answers; 5. We have compiled the best Diffraction Grating Interview question and answer, trivia quiz, mcq questions, viva question, quizzes to prepare. Page 3 | 25 . Two visible lines in the sodium spectrum have wavelengths 498 nm and 569 nm. Engineering Physics Questions and Answers – Diffraction of Light ; Engineering Physics Questions and Answers – Fraunhofer Diffraction ; Engineering Physics Questions and Answers – Difference Between Prism and Grat… Class 12 Physics MCQ – Power in AC Circuit : The Power Factor ; Class 11 Physics MCQ – Power ; Engineering Physics Question: A diffraction grating 27. See Answer See Answer See Answer done loading Question: Monochromatic light illuminates a diffraction grating having 6,284 slits per centimeter. (i) A diffraction grating of known grating spacing is used in a school laboratory to analyse the light emitted by a laser. Describe the application and explain how the diffraction grating is used or what the effects of the diffraction grating are. overlaps the second-order maximum of red light. b)calculate the smallest difference (in nm) in wavelengths surrounding 545 nm that can be resolved in the first-order diffraction pattern Aug 10, 2020 · A set of 10 past paper questions with their answers focusing on Young’s double slit experiment and waves going through a diffraction grating. It is designed to split and diffract light into its component wavelengths, similar to a prism. 574° O 18. A device used to grate cheese and other materialsc. What is the wavelength of the light? 1090 nm 544 nm 363 nm 272 nm none of the above A teacher explains a diffraction investigation to a group of physics students. c. docx Lab 8: Diffraction Grating INSTRUCTIONS Introduction In this lab, you will study diffiraction patterns produced by a monochromatic light source incident on a diffraction grating, a device that is made up of thousands of very closely spaced slits. m (1) (ii) Calculate the first order angle of diffraction of line P in the figure above. 4 The Diffraction Grating for the CIE AS Physics syllabus, written by the Physics experts at Save My Exams. Question 8: Question: The diffraction grating is an optical device that: (a) Reflects light at a specific angle (b) Refracts light through a prism (c) Separates light into its constituent colors (d) Absorbs specific wavelengths of light DIFFRACTION GRATING Structure 11. The bright fringes are produced a distance y from the center of the screen. Question: The diffraction grating of Question 7 is used at a distance L = 50. Results Table 1 PAGE 1 1. Question: A diffraction grating with 650 slits/mm is illuminated by light that gives a third-order diffraction angle of 45. Given the following values, and the positions of the dots on the screen (in metres), find the wavelength of the light, in nm. number of orders present - A diffraction grating has 122,000 lines/m. 5E-05 lines/nm is used to separate two colors of light. 97, 81 Question: A 4. A diffraction grating has a diffraction grating constant d = 2000 nm. Primary Objective Observe the interference pattern produced when laser light passes through multiple-slit grating (a diffraction grating). 023Value for θ2: 0. Solution Physics questions and answers; White light is incident on a diffraction grating with 491 lines/mm. Question: How does diffraction grating differ from a double slit? Diffraction Grating Questions and Answers for Viva. Oct 14, 2024 · The correct answer is option 1) i. 549 km; b. 600 mm D. At what angles in the first-order spectrum would you expect to find the two violet lines of wavelength 434 nm and of wavelength 410 nm? Physics questions and answers; A diffraction grating is placed in front of a laser beam, resulting in various bright spots appearing on a screen. At what angles θwill intensity maxima occur on a viewing screen if the radiation incident on the grating has a wavelength of 589 nm? of A prime example is an optical element called a diffraction grating. x 2 h This is the angle of of the first order diffraction of red light by the CD acting as a reflection diffraction grating. Which of the following statements is true for the same wavelength of light. Be specific. An opaque screen with a tiny circular aperture See Answer See Answer See Answer done loading Question: A diffraction grating with 11 500 lines/cm will exhibit the first-order maximum for light of wavelength 472 nm at what angle? (1 nm = 10-9 m) O 0. 67x10^-3m C. d is the distance between the slits on the grating (m). 1 ∘∘. 0 mm wide has 5500 rulings. DIFFRACTION GRATING. 215 lines/mm O 300 lines/mm 600 lines/mm 465 lines/mm For the laser and diffraction grating in Question 2, what is the maximum order produced? 04 O2 3 O 5 A laser beam is incident on a a diffraction grating with 300 lines/mm. This answer is Questions 1. 4 The Diffraction Grating for the CIE A Level Physics syllabus, written by the Physics experts at Save My Exams. You have an adjustable laser. 14. This line spacing is too small to produce diffraction of light. 117. 2° in the second order by this grating. The first-order maximum of the interference pattern is observed at 10. However, based on the pictures, it is fairly certain that the reflected patterns are indeed diffraction because the angle increases with wavelength, which is consistent with the formula $$\sin\theta = \frac{\lambda}{d}$$ and they are also consistent with other examples I Advanced Physics questions and answers; When a diffraction grating is illuminated with white light, the first-order maximum of green light O is farther from the central maximum than the first-order maximum of blue light. 8 nm is deflected by 43. A diffraction grating can be used to analyse the radiation emitted by a variety of sources. More past paper questions for every topic are available on my shop “Brainworks” on TES. (Total 6 marks) Mar 22, 2021 · What is meant by diffraction & classifyWhat is the condition for diffractionWhat is gratingWhat are the function of collimator and telescopeWhat kind of diff Physics questions and answers; A diffraction grating with 120 slits per centimeter is used to measure the wavelengths emitted by hydrogen gas. What wavelengths would product 5 bright lines on a screen, if non-visable EM radiation is possible? Physics questions and answers; Question 11 (8 points) A diffraction grating with 10,000 lines/cm is illuminated with light of 500 nm. What is the effective distance between the source of light and the screen in Fraunhofer Diffraction? Questions and model answers on 8. overlaps the second-order maximum of blue light. (a) At what angle, in degrees, will the first-order maximum be for 510-nm wavelength green light? Problem 6: A diffraction grating has 2000 lines per centimeter. Part (a) Find θ1 using n and λ1 in radians. 2∘. S M SOHEL RANA IU Tags Physics The Difference Between Nov 6, 2024 · Where: n is the order of the maxima, the number of the maxima away from the central (n = 0). (ii) Calculate the number of lines per mm on the diffraction grating. It is illuminated by light of wavelength 650 nm What is the angle of the first diffraction order? Enter your answer in degrees. As you can see, there are three dots on the ruler. What is the distance D Physics questions and answers; PHYS 2092 Lab 8: Diffraction Grating ANSWER SHEET Student Name: _____ Data Analysis Data Table 8. (i) Calculate the distance between the centres of two adjacent slits on this grating. Enter answer Dec 12, 2024 · Get Diffraction Multiple Choice Questions (MCQ Quiz) with answers and detailed solutions. 5 B. 0. Monochromatic light of 600 \text{ nm} is passed through the diffraction grating to produce a diffraction pattern on a screen. answer = . 1. Lets look at a section of a diffraction grating: λ A white-light source illuminates a diffraction grating that has 5. Question: A diffraction grating has 600 lines per mm. This resource is designed to help students prepare efficiently, covering critical theoretical concepts, practical experiments, and important physics applications. 3° d. HINT (a) Calculate the angle 𝜃r2 (in degrees) to the second-order maximum for a wavelength of 615 nm. Mention two types of diffraction. a. 45 degrees, and the first light has wavelength λ1 = 484 nm. 1 Introduction Expected Learning Outcomes 11. Careful measurements show that θ3=16,7, Determine how many orders will be present. 16 degrees, and the first light has wavelength λ1 = 650 nm. Grating #1 must give a second order See Answer See Answer See Answer done loading Question: A diffraction grating with 10 000 lines/cm will exhibit the first order maximum for light of wavelength 510 nm at what angle? (1 nm = 10-9 m) a. The angle between their firs maxima is Δθ=θ1−θ2=0. 1 \, \mu\text{m}. Light from a sodium lamp passes through the grating and is diffracted onto a distant screen. 9 C1 2 or 3 sf only A1 [4] 5 A teacher explains a diffraction investigation to a group of physics students. HINT (a) Find the number of illuminated lines on the grating. (a) What is the largest value of θ at which a maximum appears on a distant viewing screen? x " (b) What is the second largest value of θ at which a maximum appears on a distant viewing screen? x⋅ f (c). 1m behind the grating. We have compiled the best Spectrometer Grating Interview question and answer, trivia quiz, mcq questions Question: A diffraction grating has 2000 lines per centimeter. The light is incident normally on the grating. What is the distance between the two m=1 fringes Find step-by-step Physics solutions and the answer to the textbook question Visible light passes through a diffraction grating that has $900 {slits} / {cm}$, and the interference pattern is observed on a screen that is $2. Mar 16, 2013 · Ans: Grating spectrum is a spectrum produced as a result of diffraction by a grating whereas; prismatic spectrum is a consequence of dispersion of light by a prism. What is the spacing between lines; that is, what is d? A. Using the angle calcualted in Q6 and the. At what angle will the first-order blue-green wavelength of mercury appear? What other orders can be seen, and at what angle will they appear? b)The diffraction grating of the previous question is used at a distance L = 50. Randomized Variablesλ = 515 nm At what angle, in degrees, will the first-order maximum be for 515-nm wavelength green light? A diffraction grating has 2000 lines per centimeter. 5. If a is the width of the slits and b the distance between the slits, then a + b is called as _____ 3. In grating spectrum we can observe different orders of spectral lines on either side of spectrum which do not happen in prismatic spectrum. a) find the number of illuminated lines on the grating. 5E−05 lines/ /nm is used to separate two colors of light. The same light produces interference fringes on a screen 1. Page 2 | 25 . 2um distance separation, a distance between a bright fringe and the central fringe was measured; then, the sin of an angle at which the corresponding bright fringe is observed was calculated based on the measured values. nm Physics questions and answers; Suppose that you have a reflection diffraction grating with n= 110 lines per millimeter. 99, 9. Can be used as classroom activity, homework, revision or assessment. nm Answer to When a diffraction grating having 6200 lines/cm is. 'In this investigation a laser will be used to shine monochromatic light of wavelength 581. 4 Physics questions and answers; A diffraction grating with n = 3. B PE E T O Words 6. 2. 62° c. Diffraction grating. Physics questions and answers; A diffraction grating with 663 lines per centimeter is illuminated by a He-Ne laser of wavelength 633 nm. A diffraction grating 20 mm wide has 6000 rulings. The CBSE Class 12 Physics Viva Questions with answers PDF provides a detailed compilation of crucial viva questions along with their answers, helping students prepare thoroughly. 7° 32. For a given wavelength i and a diffraction grating of spacing d. Download these Free Diffraction MCQ Quiz Pdf and prepare for your upcoming exams Like Banking, SSC, Railway, UPSC, State PSC. Physics questions and answers; When a diffraction grating having 5000 lines/cm is illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47. a)A diffraction grating with d = 2000 nm is used with a mercury discharge tube. An opaque screen with many closely spaced slitsd. Spectrometer Grating Questions and Answers for Viva. State the essential condition for diffraction of light to occur. Diffraction grating: It is an optical element that splits or divides a light of lots of different wavelengths into individual components by wavelengths. 20 conceptual questions and answers about diffraction grating: 1. 5 ∘. When used with a certain wavelength of light, both gratings give first order maxima. 51° b. The light diffracts on passing through the slits and produces an interference pattern. (a) an image is formed at only one angle; (b) at least two orders are always seen; (c) the number of orders seen can be any number and depends on d and 2: (d) there can never be more than four orders seen. Part A What is the highest order that contains the entire visible spectrum? (The wavelength range of the visible spectrum is approximately 400-700 nm. Jan 19, 2008 · FAQ: Diffraction Grating: Questions & Answers What is a diffraction grating? A diffraction grating is an optical component that consists of a large number of evenly spaced parallel slits or grooves. How many side maxima on one side from the central maximum are formed in the diffraction pattern? 8% four three one two five Determine the diffraction grating constant. Calculate the angle to the second maximum. What is the distance D from the slit to the first-order image for the blue-green wavelength of mercury? Show your work. 311° O 65. cebznksetwifcsvpcgdegcqtftgxjcwilaodlappbkddyuairypu