If the amplitude of a wave at a distance `r` from a point source is `A`, the amplitude at a distance `2 r` will beA. `2 A`B. `A`C. `A//2`D. `A//4`

If the amplitude of a wave at a distance `r` from a point source is `A

1.	If the amplitude of a wave at a distance `r` from a point source is `A`, the amplitude at a distance `2 r` will beA. `2 A`B. `A`C. `A//2`D. `A//4`
Answer» Correct Answer - C `I prop (1)/(r^(2)) prop A^(2) rArr (1)/(r ) prop A` `A_(1)r_(1) = A_(2)r_(2) rArr Ar = A_(2). 2r rArr A_(2) = A//2`

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If the amplitude of a wave at a distance `r` from a point source is `A`, the amplitude at a distance `2 r` will beA. `2 A`B. `A`C. `A//2`D. `A//4`

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