First slide

Standing waves

Question

When a stationary wave is formed then its frequency is

Easy

A

Same as that of the individual waves
B

Twice that of the individual waves
C

Half that of the individual waves
D

None of the above

Solution

If $y_{i n c i d e n t} = a s i n (ω t - k x) a n d y_{s t a t i o n a r y} = a s i n (ω t) c o s k x$ then it is clear that frequency of both is same ( $ω$ ).

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