figure. Shows a student setting up wave wave on a long stretched string. The student's hand makes one complete up and down movement in `0.4 s` and in each up and down movement the hand moves by a height of `0.3 m`. The wavelength of the waves on the string is `0.8 m`.

The wave speed is

Options

A. `2 m//s`
B. `0.3 m`
C. `0.075 m`
D. Cannot be predicated

Answer

a

Explanation

Frequency`=(1)/("Time period" )=(1)/(0.4)=2.5 Hz`
Amlitude`=(1)/(2)xx0.3m=0.15m`
wave speed `=flambda=2.5xx0.8m=2m//s`