Length of a string tied to two rigid support is `40cm`. Maximum length (wavelength in cm) of a stationary wave produced on it is

Options

A. 20
B. 80
C. 40
D. 120

Answer

B

Explanation

When the string is plucked in the middle , it vibrates in one loop with nodes at fixed ends and an anti - node in the middle .
so ,`(lambda)/(2)=t` ` rArr lambda= 2 xx 40 = 80 cm`