Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by 1%, 3 beats are produced in 2sec, the initial frequency of vibration of each wire is:
300 Hz
f=12π√Tuf∝√Tf−ff×100=K√T−T√T×10032f0=12×1%32f0=12×1100f0=300Hz