A tuning fork of frequency 480 Hz is use...

A tuning fork of frequency `480 Hz` is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, `l_(1) = 30 cm` and `l_(2) = 70 cm`. Then, `v` is equal to :

`379ms^(-1)`

`332ms^(-1)`

`338ms^(-1)`

`384ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:

`lambda = 2(l_(2)-l_(1))` (Resonance column exp.)
=` 2 xx 40 cm`
`V = 480 xx 80 = 384 m//s`

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