Quiz 9
Section:
Phys 222, Fall 2014
Name:
Problem 1.(2 points.) The middle of the first order maximum, adjacent to the central
bright fringe in a double-slit experiment, corresponds to a point where the optical path
length difference from the two slit is equal to
A) undefined
B) 0
C) 1 wavelength
D) 1/2 wavelength
E) 1/4 wavelength
Problem 2.(1.5 points.) If you shoot a single photon through two slits to hit a screen
it
A) hits randomly on the screen with an equal probability
B) cannot hit in the middle because the block is in the way.
C) must hit at the maximum of the interference pattern.
D) will hit anywhere that it can travel in a straight line from the gun to the screen.
E) has a chance of hitting anywhere on the screen, but on average a better chance at
hitting where the interference pattern is brightest.
Problem 3.(1.5 points.) What is the energy of a photon of blue light (λ = 450 nm) in
units of eV = 1.6 ∗ 10−19 J? E = hc
where h= 6.626 ∗ 10−34 Js and c= 3 ∗ 108 m/s.
λ
Extra Credit.(2 points.) George is running late and has a date with a woman in the
Andromeda galaxy that would require him to drive faster than the speed of light. Why
can’t George make it to the date on time?
1. He is wearing his gore-tex coat which causes too much drag.
2. Nothing can travel faster than the speed of light.
3. Because the ocean called; they’re running out of shrimp.
4. Because you had to have the big salad.