CGPET 2016 Solved Paper

A sonometer wire under tension of 64N vibrating in its fundamental mode is in resonance with a vibrating tuning fork. The vibrating tuning fork is now moved away from the vibrating wire with a constant speed and an observer standing near sonometer hears one beat per second. The speed with which the tuning fork moved is (speed of sound in air is 330m∕ s, vibrating portion of sonometer wire has length 10‌cm and mass 1‌gm)