Question

Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity is 20m/s, its frequency is?

(a) 2Hz

(b) 4Hz

(c) 5Hz

(d) 10Hz

This question was addressed to me in semester exam.

The origin of the question is Acoustics topic in section Waves of Engineering Physics I

Answer 1

Correct option is (c) 5Hz

To explain I would say: 5× ʎ/2=10 or ʎ=4m

v=20m/s^-1

γ=v/ʎ=20/4=5Hz.