Question

The length of a string tied across two rigid supports is 40cm. The maximum wavelength of a stationary wave that can be produced in it is………cm. 

(A) 20 

(B) 40 

(C) 80 

(D) 120

Answer 1

The correct option (C) 80   

Explanation:

length of string across support = 40 cm 

when string is plucked in middle, it vibrates with nodes at end and antinodes in middle 

∴ (λ/2) = length 

∴ = 2 × 40 = 80cm