Question

A sound wave having a wavelength of 2 cm is
travelling in water. If the velocity of sound in
water is 1600 ms-l, find the frequency of the
sound wave.​

Answer 1

Answer:

Explanation:

wavelength =2cm=0.02m

velocity=16m/s

f=?

t=?

velocity = wavelength ×frequency

16=0.02×f

f=16÷0.02

f=800hz

t=1/f

t=1/800

t=0.00125sec

Answer 2

Answer:

Explanation:

The expression for velocity (v) of a wave in a medium  is given by,

        $v=f \lambda$      

       that is,

       $f = \frac{v}{\lambda}$      ...(1)

  where f is the frequency and $\lambda$ is the wavelength of the wave.

Given,

The wavelength of the sound wave in the water =   $2\ cm = 0.20\ m$

The velocity of sound in water  =    $1600\ m/s$

Using equation(1),

The frequency of sound wave  =    $\frac{1600}{0.20} =8000\ Hz$