Quiz 4 Solutions

# Quiz 4 Solutions - Physics 1C Fall 2005 Quiz 4 November...

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Physics 1C Fall 2005 Quiz 4 November 18 th Version A 1. If a wave from one slit of a Young’s double-slit set-up arrives at a point on the screen one wavelength behind the wave from the other slit, what is observed at that point? a. dark fringe b. bright fringe c. multi-colored fringe d. gray fringe, neither dark nor bright Ans (b), if path difference is exactly one wavelength, crests align with crests and troughs align with troughs so you get constructive interference and a bright spot 2. In a Young’s double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the separation between slits is doubled? a. ¼ b. ½ c. 1 d. 2 ans (b) y bright = m λ L/d, double d, halve y 3. In a Young’s double-slit interference apparatus, the distance from the slits to the screen is doubled. The distance between adjacent light and dark fringes changes by a factor of: a. ¼ b. ½ c. 1 d. 2 ans (d) y bright = m λ L/d, double L, double y 4. In a Young’s double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the wavelength of the source is doubled? a. ¼

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## This note was uploaded on 04/17/2008 for the course PHYS 1C taught by Professor Smith during the Fall '07 term at UCSD.

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Quiz 4 Solutions - Physics 1C Fall 2005 Quiz 4 November...

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