Question

A sound wave of wavelength 80 cm in glass enters into the air. If the velocities of
sound in glass and air are 5600 m/s and 340 m/s, calculate the wavelength of sound
in air.​

Answer 1

Answer:

Explanation:hey mate you do it by formula given frm ur text book I am serious not joking refer your t. B

Answer 2

Answer:

A sound wave of wavelength 80 cm in glass enters into the air. If the velocities of  sound in glass and air is 5600 m/s and 340 m/s,  the wavelength of sound  in the air will be $0.0486\ m$

Explanation:

• Consider a wave of frequency f and wavelength $\lambda$

        then, we have the expression for velocity (v) as,

        $v=f \lambda$      

       that is,

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

       or

       $\lambda= \frac{v}{f}$      ...(2)

• Since the source of the wave is the same, the frequency of waves produced in water and glass will have the same value.

       

In the question, it is given that,

the wavelength of sound in glass      =   $80\ cm = 0.80m$

the speed of sound in glass               =    $5600\ m/s$

Using equation(1),

frequency of sound,

$f = \frac{5600}{0.80} = 7000 Hz$

Given,

The velocity of sound in air  =    $340\ m/s$

Using equation(2),

• the wavelength of the sound wave in air     =    $\frac{340}{7000} = 0.0486\ m$