Question

A string fixed at both ends has consecutive standing wave modes for which the distances between adjacent nodes are 18 cm and 16 cm respectively. The minimum possible length of the string is 

(a) 144 cm 

(b) 152 cm 

(c) 176 cm 

(d) 200 cm

Answer 1

Correct option: (a) 144 cm

Explanation: 

The length of the string must be in integral multiple of λ/2. 

The minimum of the given values is 144 cm.