1.A sonometeris set on the floor of a lift.when the lift is at rest,the sonometer wire vibrates with fundamental frequency 256hz.when the lift goes up with acceleration a=9g/16, the frequency of vibration of the same wire changes to ---------

f=12lTμ256=12lMgμ
Inside the moving lift
f1=12lT1μ=12lMg+aμ=12lMg+9g16μf1=5412lMgμ=54×256=320 Hz
therefore, frequency of the wire changes to 320 Hz

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