# General Knowledge - Physics - Discussion

### Discussion :: Physics - Section 1 (Q.No.47)

47.

Intensity of sound at a point is ____ its distance from the source.

 [A]. directly proportional to [B]. inversely proportional to [C]. directly proportional to square of [D]. inversely proportional to square of

Explanation:

No answer description available for this question.

 Sunny said: (Jun 6, 2011) The intensity of light observed from a source of constant intrinsic luminosity falls off as the square of the distance from the object. This is known as the inverse square law for light intensity.

 Vivetha.H said: (May 12, 2012) Thank you sunny for your wonderful explanation

 Durga said: (Aug 22, 2013) The intensity of light observed from a source of constant intrinsic luminosity falls off as the square of the distance from the object. This is known as the inverse square law for light intensity.

 Ganesh said: (Oct 4, 2013) This is not light talking about sound. The principle is different.

 Narayan said: (Jun 28, 2014) Intensity of sound is nothing but power propagating per unit area i.e. (P/A). Means it inversely proportional to area ie. Inversely proportional to distance square.

 Jall said: (Feb 16, 2015) Is it not directly proportional, the further you are from the source of sound the fainter it is, therefore the lesser the intensity.

 Kirti Malik said: (Sep 9, 2016) Here we are talking about intensity, greater in the intensity is greater be the sound strength. At large distances, sound strength is low and hence sound intensity is also low. And following the inverse square law the intensity of sound varies inversely as the square of the distance between listener and sound source.

 Setto Begashaw said: (Oct 17, 2017) The intensity is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy. intensity(I) = power/area. But area is the product of pi and square of the radius. This implies that as the distance is far more, less intensity will be.