5. which one of the following statements does not accurately describe vibrations?
a. two bodies with the same vibration frequency that are placed next to each other will exhibit sympathetic vibrations as one body causes the other to vibrate.
b. forced vibrations, such as those between a tuning fork and a large cabinet surface, result in a much lower sound than was produced by the original vibrating body.
c. resonance occurs as a result of sympathetic vibrations.
d. a non-vibrating object can begin to vibrate as a result of forced vibrations.
8. which of the following statements is untrue in regard to sound traveling in air?
a. sound waves in the air are transverse and consist of compressions and rarefactions of air molecules.
b. the area covered by the wave front increases as the wave advances, but the energy passing through a wave front in a unit of time decreases.
c. during a single vibration of the diaphragm, molecules in the air near it will also complete one vibration.
d. as the distance from the earth increases, the sound wave intensity also decreases due to the lessening density.
18. which of the following statements incorrectly describes a scenario where the source of the sound waves and the person hearing the sound are remaining stationary?
a. the frequency of the sound waves is not affected by the nature of the medium.
b. the frequency of the sound waves is not altering as a result of the distance between the sound source and the listener.
c. the frequency of the sound waves will change for the listener as a result of the doppler effect.
d. the frequency of the sound waves will remain the same to the listener.