Question

5. The _______ of a sound wave is defined as the amount of energy passing through a unit area of the wave front in a unit of time. A. compression B. intensity C. amplitude D. frequency 6. If two waves with equal amplitudes and wavelengths travel through a medium in such a way that a particular particle of the medium is at the crest of one wave and at the trough of the other wave at the same time, what will happen to that particle? A. The particle will cause beats as a result of the wave combination. B. The particle will move halfway to the crest due to reinforcement. C. The particle will vibrate with double amplitude due to resonance. D. The particle will remain stationary due to interference. 7. When the temperature of the air is 25°C, the velocity of a sound wave traveling through the air is approximately A. 320 m/s. B. 332 m/s. C. 347 m/s. D. 357 m/s. 8. If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have A. a frequency higher than the original frequency. B. a pitch lower than the original pitch. C. an amplitude lower than the original amplitude. D. a period higher than the original period. 9. If a person is in front of a smooth surface from which a sound is reflected, the person would hear a sound that A. seems to lack overtones. B. seems to come from behind the surface. C. has a higher intensity than the sound produced by the source. D. has a higher pitch than the sound produced by the source.

Answer 1