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Two waves of frequencies 20 Hz and 30 Hz...

Two waves of frequencies 20 Hz and 30 Hz. Travels out from a common point. The phase difference between them after 0.6 sec is

A

Zero

B

`(pi)/(2)`

C

`pi`

D

`(3pi)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
A
Beat period = `(1)/(30-20)=0.1` sec
`Deltaphi=(2pi)/(T)xxDeltat=(2pi)/(0.1)xx0.6`
`implies Deltaphi=12pi` or zero.
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