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

[MP PMT 1985]

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A/2

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A/4

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Solution

The correct option is C
A/2

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

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If amplitude of waves at distance r from a point source is A, the amplitude at a distance 2r will be [MP PMT 1985]

The correct option is C A/2 1∝a2∝1d2⇒a∝1d

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

[MP PMT 1985]

The correct option is C
A/2

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