First slide

Travelling wave

Question

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

Moderate

A

2A
B

A
C

A/2
D

A/4

Solution

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

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