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PHYS1112ProbSet1

# PHYS1112ProbSet1 - Physics 1112 Fall 2009 PS#1 Solutions...

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Physics 1112 Fall 2009 PS #1 Solutions Page 2 of 11 Problem 3: (a) Find the wavelength for a typical AM radio wave with a frequency of 970 kHz. (b) Find the wavelength for a typical FM radio wave with a frequency of 98 . 5 MHz. In both parts of this problem, we use the fact that the product of wavelength and frequency is equal to the wave speed for any periodic wave. (a) Using the numbers given, and remembering that units of Hz are equivalent to 1/s, λ = c f = 3 . 00 × 10 8 m/s 970 × 10 3 Hz = 309 m . (b) For these numbers, λ = c f = 3 . 00 × 10 8 m/s 98 . 5 × 10 6 Hz = 3 . 05 m . Problem 4: You’re caught running a red light on Hwy 316. Attempting to impress the skeptical patrol officer with your physics knowledge, you claim that you were traveling so fast that the red light ( λ = 687 nm) actually appeared yellow ( λ = 583 nm) to you. (a) How fast would you have been traveling (in mi/hr) had that been the case? (b) If you had been traveling that fast and the light actually was yellow, what color would it have seemed to you?
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PHYS1112ProbSet1 - Physics 1112 Fall 2009 PS#1 Solutions...

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