A source of sound emits a spherical wave. Which of the following is true about t

Question

A source of sound emits a spherical wave. Which of the following is true about the energy and intensity of the wave as it moves (forward in time)? The total energy of the wave and the intensity of the wave are both constant. Both the total energy and the intensity of the wave increase. The total energy of the wave is constant, but the intensity of the wave increases. The total energy of the wave is constant, but the intensity of the wave decreases. Both the total energy and the intensity of the wave decrease. To reduce loudness of a drummer's sound, insulation is added around a drummer as she plays. The intensity level 5 m from the drummer - before insulation is added - is 80 dB. The intensity level of the drummer with sound insulation at the same location 5 m from the drummer is 60 dB. By how many orders of magnitude did the sound insulation decrease the intensity / at this location? Assume the drummer does not change the way she plays before and after sound insulation is added.

Explanation / Answer

1(d) The total energy of the wave is constant but the intensity of the wave is constant

3(b) -Dmax where displacement is perpendicular to the direction of wave travel

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