As a wave propagates

I. The wave intensity remains constant for a plane wave.

II. The wave intensity changes inversely as the square of the distance from the source for a spherical wave

III. The intensity of the spherical wave over any spherical surface centred at the source remains the same at all times
The correct statement(s) is/are

I and II only

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I, II and III

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II and III only

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II only

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Solution

The correct option is A I and II only
The wave intensity remains constant for a plane wave. It changes inversely as the square of the distance from the source for a spherical wave

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Similar questions

As a wave propagates

(i)The wave intensity remains constant for a plane wave.

(ii)The wave intensity changes inversely as the square of the distance from the source for a spherical wave.

(iii) The intensity of the spherical wave or at any spherical surface centered at source remains the same at all times.

The correct statement(s) is/are

A spherical source of power 4 W and frequency 800 Hz is emitting sound waves. The intensity of waves at a distance 200 m is

\frac{π}{2}

y = (a_{0} / r) sin k (r - v t)

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