Question

the phase difference between two points separated by 1m in a wave of frequency 120hz is 90° the wave velocity is

Answer 1

480 m/s is the answer

Answer 2

path difference = lamda fai /2

$\pi$

1=lamda/2 pi ×2 pi

1=lamda/4

lamda =4m

hence v=n×lamda

=120×4=480m/sec