Along the direction of propagation of one wave of frequency 120 Hz, phase difference between two particles separated by 1 m distance is `90^(@)`. Find velocity of this wave.

Options

A. `180 m//s`
B. `240 m//s`
C. `480 m//s`
D. `720 m//s`

Answer

C

Explanation

We know that, `Delta phi = (2pi )/(lamda ) (Delta x )`
`therefore Delta phi = (2pi f )/(v ) (Delta c ) " "(because v= f lamda )`
`therefore (pi)/(2) = (2 pi xx 120)/(v) (1)`
`therefore v = 480 m//s`