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Noise Pollution

(1) 18 dBdro ...

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(1) 18 dBdro 403. A listener x hers a sound level of 50 dB when he is at a distance 1 km from the nstrument. Anothery at a distance 10 km from the listener x hears a sound level of(1) 30 dEB(2) 20 dBA 5 dR

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Similar questions

x

hears a sound level of

50 d B

when he is at a distance

1 k m

from the instrument. Another listener

y

10 k m

from the listener

x

hears a sound level of ____.

Q. Figure shows a source of sound moving along X-axis at a speed of 22 m s⁻¹ continuously emitting a sound of frequency 2.0 kHz which travels in air at a speed of 330 m s⁻¹. A listener Q stands on the Y-axis at a distance of 330 m from the origin. At t = 0, the sources crosses the origin P. (a) When does the sound emitted from the source at P reach the listener Q? (b) What will be the frequency heard by the listener at this instant? (c) Where will the source be at this instant?

Q. A point source emits sound waves with an average power output of

40 π W

, find distance at which sound reduces to level of 30 dB.

(I_{m i n} = 10^{- 12} W / m^{2})

Q. The sound from a trumpet radiates uniformly in all directions in

20^{o} C

air. At a distance of

5.00 m

from the temperature, the sound intensity level is

52.0 d B

. The frequency is

587 H z

.
At what distance is the sound intensity level

30.0 d B

Q. Imagine that a listener who is at rest is listening to the sound of frequency

20 H z

produced by a stationary source. If the source starts moving away from the listener, will the listener be able to hear the sound? Justify your answer.

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