## (solution) 1# A sound of intensity I = 10 -6 W/m 2 falls on a detector of

1#  A sound of intensity I = 10-6 W/m2 falls on a detector of area A = 7 x 10-5 m2.
(This is about the size of an eardrum.)

If the sound continues for 30 s, the amount of energy received =

2#  If the whirring of a single fan produces a sound intensity level (SIL) of 50 dB, how many identical fans would need to be operated simultaneously to make a SIL of 63 dB?

3#  The smallest change in sound level that can be detected by a person with normal hearing is 1 dB. This corresponds to a percentage difference in sound intensity of

4#  You are attending a rock concert wearing earplugs that provide a 13 dB reduction in sound level.

The percentage of the sound energy getting through the plugs =

5#  At a rock concert, a dB meter registers 125 dB when placed 3.0 m in front of a loudspeaker on the stage.[Assume uniform spherical spreading of the sound from the speaker.]

The sound power output of the speaker =

6#  At a rock concert, a dB meter registers 125 dB when placed 3.0 m in front of a loudspeaker on the stage.[Assume uniform spherical spreading of the sound from the speaker.]

The distance from the speaker at which the sound level will be reduced to 90 dB is

7#  A loudspeaker is supplied with 5.0 W of electrical power and has an efficiency of 10% for converting this electrical power to sound power.

The sound power output of the speaker = W.
This corresponds to a sound power level = dB.

8#  A loudspeaker is supplied with 5.0 W of electrical power and has an efficiency of 10% for converting this electrical power to sound power.

At a distance of 4.0 m, the sound intensity =

9#  A loudspeaker is supplied with 5.0 W of electrical power and has an efficiency of 10% for converting this electrical power to sound power.

Assuming that the sound from the speaker radiates equally in all directions, at a distance of 2.0 m the sound intensity = W/m2, the sound pressure = N/m2, and the sound power level = dB.

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This question was answered on: Jan 30, 2021

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