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Equation of motion in the same direction...

Equation of motion in the same direction is given by `y_(1) =A sin (omega t - kx), y_(2) = A sin ( omega t - kx- theta )`. The amplitude of the medium particle will be

A

`2 A cos ((theta)/(2))`

B

`2A cos theta`

C

` sqrt(2) A cos ((theta)/(2))`

D

` 1.2 f, 1.2 lambda`

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The correct Answer is:
A
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