Question

Q) given that sound travels in air at speed of 340 m/s, find the wavelength of the waves in air produced by a 20hz sound source. If the same source is put in water tank what would be the wavelength of the sound ( speed of sound in water is 1480m/s?)

Answer 1

velocity = frequency × wavelength
340= 20 × x
x = 340/20
x= 17 cm
frequency in water
1480/20=x
x = 74 cm

Answer 2

wavelength of the waves in air= speed /Frequency  

wavelength of the waves in air = 340/20

wavelength of the waves in air = 17 m.

 If the sound source is put in a water tank, The frequency of the waves remains unchanged.

i.e. Frequency = 20 Hz

Speed of sound in water = 1480m/s

Wavelength of the waves in water = speed in water/ frequency  

Wavelength of the waves in water = 1480/20 m.

Wavelength of the waves in water = 1480/20 m.

Wavelength of the waves in water = 74 m.