20. The maximum distance a molecule has been moved from its normal position by a
ID: 1457567 • Letter: 2
Question
20. The maximum distance a molecule has been moved from its normal position by a wave is A. frequency. B. rarefaction. C. amplitude. D. compression. 21. A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes A. nine times as low. B. nine times as high. C. three times as high. D. three times as low. 22. In which one of the following locations can a person hear the echo of a sound? A. Less than 33.2 meters behind the reflecting surface B. Less than 16.6 meters in front of the reflecting surface C. At least 16.6 meters in front of the reflecting surface D. At least 33.2 meters behind the reflecting surface 23. A wave with a period of 0.008 second has a frequency of A. 80 Hz. B. 12.5 Hz. C. 800 Hz. D. 125 Hz. 24. If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is A. 90 degrees. B. 80 degrees. C. 0 degrees. D. 40 degrees. 25. The part of the ear where sound wave compressions and rarefactions cause the eardrum to vibrate is the A. outer ear. B. auditory nerve. C. inner ear. End of exam D. middle ear
Explanation / Answer
20) The maximum distance is amplitude.
21)
The intensity is inversely proportional to the square of the distance. Thus, the intensity becomes nine times as low.
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