Vikas TU
Last Activity: 4 Years ago
Let the frequency of tuning fork be N
As the frequency of vibration string∝1 / length of string For sonometer wire of length 20cm,frequency must be (N+5) and that for the sonometer wire of length 21 cm, the frequency must be (N−5) as in each case the tuning fork produces 5 beats/sec with sonometer wire.
Hence n1I1=n2I2
⇒(N+5)×20=(N−5)×21
⇒N=205Hz