Question

an observer standing at the sea coast observes 48 waves reaching the coast per minute if the wavelength of each wave is 10 m then the velocity of the wave

Answer 1

Given ;
no. of waves = 48
time = 1 min = 60sec
Wavelength = 10 m

f = 48/60

v = frequency×Wavelength
= (48/60)×10
= 8 m/s

Answer 2

Hope it is clear to you.