If amplitude of waves at distance r from a point source is A , the amplitude at a distance 2 r will be

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If amplitude of waves at distance $r$ from a point source is $A$, the amplitude at a
distance $2 r$ will be

PhysicsWaves and SoundJEE Main

Options:

A $2 A$
B $A$
C $A / 2$
D $A / 4$

Solution:

1733 Upvotes Verified Answer

The correct answer is: $A / 2$

$f \propto a^2 \propto \frac{1}{d^2} \Rightarrow a \propto \frac{1}{d}$

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