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Two waves travelling in a medium in the ...

Two waves travelling in a medium in the x-direction are represented by `y_(1) = A sin (alpha t - beta x)` and `y_(2) = A cos (beta x + alpha t - (pi)/(4))`, where `y_(1)` and `y_(2)` are the displacements of the particles of the medium `t` is time and `alpha` and `beta` constants. The two have different :-

A

speeds

B

directions propagation

C

wavelengths

D

frequencies

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The correct Answer is:
B
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