Homework07 - relative to the direction of the zeroth order...

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Physics 165/164 Homework Assignment #7 Due, Friday 4 April 2008 at the beginning of class. Read Handout #9: sections 32.3 and re-read section 32.2. Solve Problems: 1. A Young’s (double-slit) experiment with d =0 . 020 mm and L =85 . 0 cm uses 550 nm light. What is the spacing between adjacent bright spots on the screen? 2. With the two slits of a Young’s experiment setup separated by 0.35 mm, the interference pattern has bright spots with an angular spacing of 0.065 o . (In other words, the “beams” creating two adjacent bright spots travel in directions separated by 0.065 o .) What is the wavelength of the light illuminating the slits? 3. A green laser pointer ( λ = 530 nm) illuminates a diffraction grating. The distance between the m = 0 and m = 1 bright spots is 12.0 cm on a screen that is 3.5 m behind the grating. How many lines/mm does this grating have? 4. Red light at 700 nm is diffracted by a grating with 3000 lines per cm. At what angle,
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Unformatted text preview: relative to the direction of the zeroth order bright spot, is the Ffth order bright spot? Dates to remember: Exam #3, 8:30 am, Wednesday, 9 April 2008. “The young spet in English Lit. ..lectured me severely on the fact that in every century people have thought they understood the Universe at last, and in every century they were proved to be wrong. It follows that the one thing we can say about our modern ‘knowledge’ is that it is wrong . My answer to him was. ..when people thought the Earth was ±at, they were wrong. When people thought the Earth was spherical they were wrong. But if you think that thinking the Earth is spherical is just as wrong as thinking the Earth is ±at, then your view is wronger than both of them put together.” Isaac Asimov, The Relativity of Wrong...
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