Question

If a wave vibrates up and down twice each second and travels a distance of 20 m each second and travels a distance of 20 m each second, what is its frequency? Its wave speed?

Answer 1

Answer:

Frequency is 0.5 Hz and the wave speed is 10 m/s.

Explanation:

As we know that frequency is defined as the how many times the no of cycles repeat in one second so if the wave is vibrating up and down  twice during 1 second then the frequency in 1 second is

$f=\frac{1}{2} hz\\F=0.5hz$

Therefore frequency is 0.5 Hz.

Now the distance of wawe in each second is,

$d=20m$

Now the wave velocity is,

$v=fd$

Here, f is frequency, d is the distance, v is the wave velocity.

Substitute all the variables

$v=0.5\times 20\\v=10m/s$

Therefore the wave speed is 10 m/s.