Question

A sound wave travels at a speed of 339 m/s. If its wavelength is 1.5 cm, what is the frequency of the wave? will it be audible?

Answer 1

Speed  ⇒ 339 m/s

Wavelength ⇒ 1.5 cm 

now change it to metre
            ⇒ 1.5 / 100
            ⇒ 0.015 m 

    Speed = Wavelength x Frequency

⇒ 339 m/s  = 0.015m x Frequency

⇒ Frequency = 339 m/s / 0.015m
                      
                      = 22600 Hz.

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

Answer 2

Speed of sound wave = 339 m/s
Wavelength = 1.5 cm = 0.015m

Speed = Wavelength x Frequency
339 = 0.015 x Frequency
Frequency = 339/ 0.015 = 22,600 Hz

Audible range for human beings = 20Hz - 20,000Hz

But it is of 22,600Hz. So, this sound won't be audible.