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p101chap15pretest

p101chap15pretest - Chapter 15 Making Waves 1...

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Chapter 15: Making Waves 1. Electromagnetic waves are generally A. transverse waves. B. longitudinal waves. C. a 50/50 combination of transverse and longitudinal waves. D. standing waves. Answer: A 2. The period of a sound wave is the 3. The Doppler effect refers to changes in a sound wave’s 4. If the speed of sound is 1100 feet per second and a tuning fork oscillates at 440 cycles per second, what is the wavelength λ of the sound produced? 5. On a day when the speed of sound in air is 340 m/s, a lightning bolt is observed and the resultant thunderclap is heard 5 seconds afterwards. About how far away was the lightning bolt? A. 1700 m B. 88,000 m C. 68 m D. 1020 m Answer: A 6. You hear a musician playing a series of notes of increasing frequency. As the frequency increases, the wave speed A. decreases. B. stays the same. C. increases. Answer: B

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7. Suppose an audible sound wave were being produced at a frequency of 800 cycles per second. If the frequency were doubled, the sound would become 8. Jim the meteorologist has predicted fair weather all day, but sees flashes of lightning followed by rolls of thunder. To calculate the distance to the lightning bolt, Jim should measure the time between the instant he first sees a lightning flash and the 9. As a wave passes from one medium into another, it often happens that its speed increases with no change in frequency. Under these circumstances, the wavelength A. decreases. B. stays the same. C. increases. Answer: C
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p101chap15pretest - Chapter 15 Making Waves 1...

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