Superposition, Huygens and Two Slit Interference

  1. Developed by: Rachel and Hinch

Should be easy - if you were paying attention

Question 1: Which of these is not a condition for destructive interference?
The waves are antiphase
The waves are in phase
The waves are coherent

Question 2: What does coherent mean?
Same source
Same frequency
In phase
Same wavelength

Question 3: What is the central maximum?
The line which is an equal distance from both slits
The line where the greatest superposition occurs
The point where the screen must be placed to get the interference pattern

Question 4: If the two slits are 10mm apart and they produce an interference pattern on a screen 30cm away where the distance between the central maximum and the first subsidiary maximum us 25mm, what was the wavelength of the wave?
120 mm
1.2 mm
8 1/3 mm
5/6 mm

Question 5: fringe width = 1.0cm
wavelength = 0.1cm
spacing between sources = 2.0cm
What is the distance to the screen?
2.0 cm
10 cm
0.05 cm
20 cm

Question 6: What is the main feature of Huygen's theory?
interference
wavefronts
wavelets

Question 7: Why is the double slit experiment important?
It proves that light acts like a particle
It proves that light acts as a wave
It proves waves are diffracted

Question 8: What is the path difference for constructive superposition?
(n + 1/2)λ
λ^2
(n + 1)λ
nλ

Question 9: What do you get if a wave reflects back on itself?
A stationary wave
total destructive superposition
an interference pattern

Question 10: What is a node?
a place of no displacement
a place of maximum amplitude
the frequency at which a stationary wave is achieved

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