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Unformatted text preview: Create assignment, 00224, Homework 11, Apr 22 at 7:14 am 1 This printout should have 14 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. Bright Band Separation 37:02, trigonometry, numeric, > 1 min, nor mal. 001 Two slits are illuminated by a 340 nm light. The angle between the zerothorder bright band at the center of the screen and the fourthorder bright band is 13 . If the screen is 130 cm from the doubleslit, how far apart is this bright band from the central peak? Correct answer: 30 . 0129 cm. Explanation: Basic Concept: y = L tan . Solution: y = L tan = (130 cm) tan(13 ) = 30 . 0129 cm . 002 What is the distance between the two slits? Correct answer: 0 . 00604576 mm. Explanation: Basic Concept: d sin = m Solution: The fourthorder bright band oc curs when m = 4; therefore, d = m sin = 4 (340 nm) sin(13 ) = 0 . 00604576 mm . keywords: First Order Bright Line 37:02, trigonometry, numeric, > 1 min, nor mal. 003 Light falls on a pair of slits 0 . 0019 cm apart. The slits are 80 cm from the screen. The first order bright line is 1 . 9 cm from the central bright line. What is the wavelength of the light? Correct answer: 451 . 25 nm. Explanation: For double slit interference, x L = d so that = xd L Dimensional analysis of : cm cm cm 1 m 10 2 cm 10 9 nm 1 m = nm keywords: Screen Distance 37:02, trigonometry, numeric, > 1 min, nor mal. 004 Light of wavelength 442 nm passes through a doubleslit system that has a slit separation of 0 . 4 mm. How far away must a screen be placed in or der for the first dark fringe to appear directly opposite both slits? Correct answer: 0 . 361991 m. Explanation: For the dark band y dark = L ( m + 1 / 2) d Since the two dark bands are just opposite the slits, then y = d/ 2, and m = 0, so L = 2 yd = d 2 = (0 . 001 m / mm) 2 (0 . 4 mm) 2 (442 nm)(1 10 9 m / nm) = 0 . 361991 m Create assignment, 00224, Homework 11, Apr 22 at 7:14 am 2 keywords: Youngs Interference Method 03 37:02, trigonometry, numeric, > 1 min, nor mal....
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 Spring '10
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