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Amplitude

The ratio of ...

Question

The ratio of amplitude of two waves is 4:3 then the ratio of maximum and minimum intensity is :

A

16:18

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B

18:16

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C

49:1

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D

94:1

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Solution

The correct option is C 49:1
Let amplitudes $4 x$ and $3 x$ respectively.
At maxima amplitudes add up giving $7 x$
At minima amplitudes substract giving $x$
Intensities ratio $= \frac{49}{1}$
Intensity is square of amplitude.

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