A progressive wave is represented by y =...

A progressive wave is represented by `y = 12 sin (5t - 4x)` cm. On this wave, how far away are the two points having phase difference of `90^circ` ?

A

`pi/2` cm

B

`pi/4` cm

C

`pi/8` cm

D

`pi/16` cm

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The correct Answer is:

C

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