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

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.