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

Two waves of frequencies 20 Hz and 30 Hz travel out from a common point. How wil they different phase at the end of 0.75 s ?

`pi`

`7pi`

`15pi`

`2pi`

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The correct Answer is:

`delta phi = (omega_(2) - omega_(1)) t`
`= 2pi (n_(2) - n_(1)) t = 2pi (30 - 20) xx 0.75`
`= 2pi xx 10 xx (3)/(4)`
`= 15 pi` rad

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