A longitudinal wave of wavelength 1cm travels in air with a speed of 330m/sec. Calculate the frequency of the wave. Can this wave be heard by a normal human.

Wavelength= 1cm= 0.01m
Velocity= 330 m/s
Frequency= Velocity/Wavelength= 330/0.01= 33000 Hz
33000>20000
Therefore, frequency of this wave is an ultrasound which can't be heard by a normal human being.

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