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Physics Unit 9

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Physics Homework, Unit 9
Deborah Williams
08/13/2014
Pg. 268-269-1. What is the source of wave motion?
Answer: A wiggle in space and time.
2. If we double the frequency of a vibrating object, what happens to its period?
Answer: Frequency and period are the inverse of each other. Frequency = 1/period or Period = 1/frequency
36. A railroad locomotive is at rest with its whistle shrieking, and then it starts moving toward you. a. Does the frequency that you hear increase, decrease, or stay the same? b. How about the wavelength reaching your ear? c. How about the speed of sound in the air between you and the locomotive?
Answer: The speed of sound of the whistle does not depend on the frequency, all sounds travel at the same speed in a given medium. There is a change in frequency due to the motion of the source, called the Doppler Effect. The wavelength of the sound is the distance between successive compressions or rarefactions, if the sound itself does not change pitch, wavelength would not change.
Pg. 291-2. Which have the longest wavelengths: light waves, X-rays, or radio waves?
Answer: X-rays have the shortest wavelengths, light waves, then radio waves are the longest.
6. Do radio waves travel at the speed of sound, at the speed of light, or at some speed in between?
Answer: Waves are different in frequency and wavelength, they all have the same speed.
Radio waves are not sound waves.
7. What do radio waves and light have in common? What is different about them?
Answer: Radio waves and light waves are all part of the electromagnetic spectrum, the frequency and wave length is different.

Pg. 315-1. Her eye at point P looks into the mirror. Which of the numbered cards can she see reflected in the mirror?
Answer: Card “1”, because there is no refraction.
23. If while standing on the bank of a stream, you wished to

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