6. On a day when there is no wind, you are at rest and a source of sound waves is moving toward you.Compared to what you would hear if the source were not moving, the sound that you hear hasA. a higher frequency and a shorter wavelength.B. the same frequency and a shorter wavelength.C. a higher frequency and the same wavelength.D. the same frequency and the same wavelength.E. none of the above.
7. Four sinusoidal sound waves propagate in the same region of our atmosphere.Rankthe waves inorder of theirdisplacement amplitude, from largest to smallest.A. Intensity = 2.010–5W/m2, frequency = 100 HzB. Intensity = 2.010–5W/m2, frequency = 200 HzC. Intensity = 4.010–5W/m2, frequency = 200 HzD. Intensity = 8.010–5W/m2, frequency = 800 HzAnswer: ACBD8. You hear a sound with a frequency of 256 Hz. The amplitude of the sound increases and decreasesperiodically: It takes 2 seconds for the sound to go from loud to soft and back to loud. This sound can bethought of as a sum of two waves with frequencies
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