Question

An open pipe resonates with a tuning fork of frequency 500Hz. It is observed that two successive nodes are formed at distances 16 and 46cm from the open end. The speed of sound in air in the pipe is?

(a) 230 m/s

(b) 300 m/s

(c) 320 m/s

(d) 360 m/s

This question was posed to me during a job interview.

I want to ask this question from Travelling Waves in section Waves of Engineering Physics I

Answer 1

Right choice is (b) 300 m/s

The best explanation: v=2γ(l2-l1)

v=2×500(46-16)cm/s

=30000cm/s=300m/s.