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Two waves represented by the following equations are travelling in the same ` y_1 = 5 sin 2pi ( 75 t - 0.25x ) y_2 10 sin 2pi ( 150 t - 0.50x ) .` The intensity ratio ` I_1//I_2 `of the two waves is

A

` 1:2`

B

`1: 4`

C

` 1: 8`

D

` 1: 16`

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The correct Answer is:
B
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