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A sound wave of wavelength 90 cm in glas...

A sound wave of wavelength `90 cm` in glass is reflected into air. If the speed of sound in glass is `5400 m//s`, the wavelength of wave in air (speed of sound in air `= 330 m//s`) is :

A

55 cm

B

5.5 cm

C

55 m

D

5.5 m

Text Solution

Verified by Experts

The correct Answer is:
B
Velocity = frequency `xx` wavelength
In glass, `5400 xx 100 = n xx 90`
or `n = (5400 xx 100)/(90)` cycles/s
In air `= (330 xx 100)/(lambda)`
`n = (5400 xx 100)/(90)`
`therefore lambda = (330 xx 100 xx 90)/(5400 xx 100) = 5.5 cm`
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