A sonometer is set on the floor of a lift. When the lift is at rest, the sonometer wire vibrates with fundamental frequency 256 Hz. When the lift goes up with acceleration a `=(9g)/(16)` , the frequency of vibration of the same wire changes to

Options

A. `512Hz`
B. `320Hz`
C. `256Hz`
D. `204Hz`

Answer

B

Explanation

`n=(1)/(2lambda)sqrt((Mg)/(mu))impliesn prop sqrt(g)implies(n.)/(n)=sqrt((g+a)/(g))`