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Loudness of sound from an isotropic point source at a distance at a distance of 70 cm is 20 dB. What is the distance (in m) at which it is not heard


Question ID - 153938 :-

Loudness of sound from an isotropic point source at a distance at a distance of 70 cm is 20 dB. What is the distance (in m) at which it is not heard

1 Answer
5876 Votes
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Answer Key : (7) -

(7)

Intensity from a point source varies with distance as

Let at distance m, intensity is

Then given 20       (i)

Let for , sound level be zero. Then intensity at that point should be

and      (ii)

From Eqs. (i) and (ii), we get



Next Question :

A point source of sound is located somewhere along the -axis. Experiments show that the same wave front simultaneously reaches listeners at  m and . A third listener is positioned along the positive -axis. What is her - coordinate (in m) if the same wave front reaches her at the same instant as it does the first two listeners?


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