A sound wave travels at a speed of 339 m s –1 . If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
Speed of sound = v = 339 m/s
Wavelength = λ = 1.5cm
= 1.5/100 m
Speed of sound = Wavelength × Frequency
Frequency = Speed of sound/ Wavelength
= v/ λ
= 339 × 1000 /15
= 22600 Hz
Frequency of sound is 22,600 Hz.
The audible range of human ear is 20 Hz to 20,000 Hz.
Since the frequency of sound is greater than 20,000 Hz, it won’t be audible .