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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/2cm`B. `pi/4cm`C. `pi/8cm`D. `pi/16cm` |
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Answer» Correct Answer - C According to question, the progressive wave is represented by y = `12 sin (5t – 4x)` cm Comparing this equation with standard equation of progressive wave, `y=sin(omegat-kx)` So we have A=12 `omega =5` Rightarrow`k=4` Here, `(omegat-kx)` is phase difference = `pi/2` `therefore 5t-4t=pi/3` When `t=0,4x=pi/2cm` `therefore x=pi/8`cm |
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