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 |
(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 |