Question

A sound wave travells at a speed of 339m/sec.If its wave length is 1.5 cm, what is the frequency

Answer 1

Speed  ⇒ 339 m/s

Wavelength ⇒ 1.5 cm 

now change it to meter

           ⇒ 1.5 / 100

           ⇒ 0.015 m 

Speed = Wavelength x Frequency

⇒ 339 m/s  = 0.015 m x Frequency

⇒ Frequency = 339 m/s / 0.015 m

                       = 22600 Hz.

It is more than 20000 Hz. Therefore, it will not be audible to the human ear.