Practice Problems
Thin Film Interference Soap Bubbles
Directions:
On this worksheet you will be investigating the basic properties of
thin film interference
.
omit
Question 1
A thin soap bubble, n = 1.36, is filled with air. Since the medium outside the bubble is also air, at which of the interfaces (air-soap and soap-air) would the light undergo a 180° phase change upon reflection?
soap-air
air-soap
at neither interface
at both interfaces
omit
Question 2
What is the wavelength of green, 496-nm light as it travels through the film?
675 nm
365 nm
496 nm
omit
Question 3
At what minimum non-zero thickness of the film will the intensity of the green light reflected back into the air be a maximum?
182 nm
124 nm
91 nm
248 nm
omit
Question 4
At what minimum non-zero thickness of the film will the intensity of the same green light reflected back into the air be a minimum, or experience destructive interference?
182 nm
91 nm
124 nm
248 nm
omit
Question 5
In general, when green light is removed from white light, the soap bubble would appear to be which color?
magenta
grey
cyan
yellow
omit
Question 6
What is the frequency of the green light as it travels through the soap film?
1.09 x 10
20
hz
8.23 x 10
-4
hz
4.45 x 10
14
hz
6.05 x 10
14
hz
omit
Question 7
If the soap film were instead specified to be 607 nanometers thick, which wavelength in the visible spectrum would be canceled?
1.21 x 10
3
nm
8.93 x 10
2
nm
4.13 x 10
2
nm
1.65 x 10
3
nm
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