Question

When two waves of almost equal frequencies `v_(1)` and `v_(2)` reach at a point simultaneously, the time interval between successive maxima is
A. `upsilon_(1)+upsilon_(2)`
B. `upsilon_(1)-upsilon_(2)`
C. `1/(upsilon_(1)+upsilon_(2))`
D. `1/(upsilon_(1)-upsilon_(2))`

Answer 1

Correct Answer - D
When two waves of almost equal frequencies `upsilon_(1) and upsilon_(2)` reach at a point simultaneously, beats are produced.
Beat frequency,`upsilon_(beat)=upsilon_(1)+upsilon_(2)`
Time interval between successive maxima
`=1/(upsilon_(beat))=1/(upsilon_(1)-upsilon_(2))`