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Chapter 17 Test
Chapter 17 Test
1. One of your new lasers has a label stating that its wavelength in air is 674 nm. The label also states that the laser’s wavelength when traveling through some type of mystery glass (not necessarily standard textbook glass) is 394 nm.
You’re not sure why this information is on the label, but it gets you thinking about what you’ve learned in Physics 106 at GCC. Eventually, you realize that this wavelength change must be related to the speed at which the laser light travels through the mystery material! You’re excited, so you promptly sit down and use your vast Physics 106 knowledge to calculate the speed of the laser’s light through the mystery glass listed on the label.
What speed do you calculate relative to the speed of light,
, rounded to two significant figures? (Your answer should be a decimal fraction between 0 and 1.) Assume that the speed of the laser light in air is equal to the speed of the laser light in vacuum.
Note: The index of refraction of the mystery glass is not necessarily equal to 1.5. It could be equal to 1.5, but it doesn’t have to be.
2. What is the precise ratio of the laser light’s frequency in the mystery glass compared to its frequency in air,
Hint: If you understand the concepts from this chapter, you should be able to answer this question with no calculations.