Question

in an experiment it was found that string vibrates in n loops when a mass M is placed on the pan. What mass should be placed on the pan to make it vibrate in 2n loops with same frequency ? ( neglect the mass of pan )
A. `M//4`
B. 4 M
C. 2 M
D. `M//2`

Answer 1

Correct Answer - b
As the string vibrates in n loops therefore, `l=(nlambda)/2`
therefore, v would become `1/2` time. As `v prop sqrt(T)`
Threrfore to make v half- time T must be made `1/4` time
i.e. M/4.