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As a spherical wavefront propagates, the...

As a spherical wavefront propagates, the amplitude (a) of a spherical wavefront varies with the distance r of the source

A

inversely as `sqrtr` i.r., a `prop 1/sqrtr`

B

inversely as r i.r., a `prop ""1/r`

C

directly as r i.r., `a prop r`

D

directly as `sqrtr` i.e., `prop sqrtr`

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The correct Answer is:
B
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