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Sound waves of wavelength1cm have a velo...

Sound waves of wavelength1cm have a velocity of 340 m/s in air. What is their frequency? Can this sound be heard by the human ear?

Text Solution

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Wavelength ` = lambda = 1 cm = 1 xx 10 ^(-2) m , ` Velocity of sound ` = v = 340 m//s `
` v = u lambda `
` therefore u = ( v)/(lambda ) = (340 )/(1 xx 10 ^(-2)) = 340 xx 10 ^(-2) `
` therefore u = 34000 Hz`
This frequency is higher than 20000 Hz and, therefore, this sound cannot be heard by the human ear.
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