Question

A sound wave travels at a speed of 399 m/s-1. If its wave length is 1.5 cm. What is the frequency of the wave

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.

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