Question

In a resonance tube, using a tuning fork of frequency `325 Hz`, the first two resonance lengths are observed at `25.4 cm` and `77.4 cm`. The speed of sound in air is
A. 338 `ms^(-1)`
B. 328 `ms^(-1)`
C. 330 `ms^(-1)`
D. 320 `ms^(-1)`

Answer 1

Correct Answer - a
Velocity of sound in air,
`v=2n(l_(2)-l_(1))=2xx 325(77.4-25.4)`
`rArr v(650xx52)/100=338ms^(-1)`