Question

Figure shows a stretched string of length L and four pipes of length L, 2L, L/2 and L/2 respectively. The string’* tension is adjusted until the speed of waves on the string equals the speed of sound waves in the air. The fundamental mode of oscillation is then set up on the string. In which pipe will the sound produced by the string cause resonance

(a) (i)

(b) (ii)

(c) (iii)

(d) (iv)

Answer 1

Correct option: (d)

Explanation:

The fundamental frequency of the wire is

Thus the frequency of fourth pipe resonates with the frequency of wire