Question

If in an experiment for determination of velocity of sound by resonance tube method using a tuning fork of `512 Hz`, first resonance was observed at` 30.7 cm` and second was obtained at `63.2 cm`, then maximum possible error in velocity of sound is (consider actual speed of sound in air is `332m//s
A. `204cm//sec`
B. `110cm//sec`
C. `58cm//sec`
D. `80cm//sec`

Answer 1

Correct Answer - D
Using `lamda=2(I_2-I_2)impliesv=2n(I_2-I_1)`
`implies2xx512(63.2-30.7)=33280(cm)/(s)`
Actual speef of sound `v_0=332(m)/(s)=33200(cm)/(s)`
Hence error `=33280-33200=80(cm)/(s)`