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HWK41s_G11

# HWK41s_G11 - means The wave travels a distance of 20 m each...

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HWK 41 (11th grade) (SOLUTIONS) (due 5/09/07) Read chp. 25 sections 9 through 11 Do: 15, 30, 31, 35 15. When a wave source moves towards a receiver, the receiver encounters an increase in frequency, not wave speed. The relative movement causes the receiver to see the wave as being compressed into one of higher frequency with smaller wavelength, and no change in speed. 30. The wave vibrates up and down twice (i.e. two cycles) each second (i.e. per second), so its frequency is 2 cycles/sec, or 2 Hz. (Notice, no calculation was needed here, but you do need to know what frequency
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Unformatted text preview: means.) The wave travels a distance of 20 m each second, so its speed is 20 m/s . (Again, no calculation is needed here, but you do need to know what the speed of a wave means.) 31. One side of the sun (the bluer point A) is moving towards us relative to the other side (the redder point B). So the sun is rotating. 35. A subsonic aircraft moves slower than the sound waves it emits. As a result, the amplitudes of these emitted waves can’t get compressed into an intense ”boom” in which the amplitudes are heard at one time. 1...
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