Last Updated On [03-11-2023]
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
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
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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 |
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(7) Intensity from a point source varies with distance as
Let at distance Then given 20 Let for and From Eqs. (i) and (ii), we get
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m, intensity is 
(i)
, sound level be zero. Then intensity at that point should be 
(ii)
Next Question :
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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?View Topper Answer
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