Question

In a large ripple tank, a wave producing machine working at a frequency of 30 Hz produces 25 complete waves in a distance of 0.5 m. What would be the velocity of an individual wave? Thanks!

By using `v=d/t`, I found 60 cm per second. I don't know what `lambda` would be if I used `v=f`lambda#

Answer 1

I tried this but I am not sure I got the question right...

Explanation:

You know that `25` complete waves (each one of length `lambda`) fit in a distance of `0.5m`, so:
`lambda ("one wave")=0.5/25=0.02m` which is the wavelength of one wave:
Using:
`v=lamda*f=0.02*30=0.6m/s=60(cm)/s`

Answer 2

`"There are 24 "lambda " between 25 complete waves"`
`lambda=(50)/24=2,08 cm`
`v=lambda*f`
`v=2,08*30`
`v=62,4(cm) /s`