A sonometer wire stretched with 64 N is vibrating in its fundamental tone and in resonance with a vibrating tuning fork. Length of the vibrating part of sonometer wire is 10 cm and the mass is 1 g. The vibrating tuning fork is taken far away from the wire at a constant speed. An observer standing near the sonometer hears 1 beat per second. If the speed of sound in the air is 300 ms'1 then the speed of tuning fork will be

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A sonometer wire stretched with 64 N is vibrating in its fundamental tone and in resonance with a vibrating tuning fork. Length of the vibrating part of sonometer wire is 10 cm and the mass is 1 g. The vibrating tuning fork is taken far away from the wire at a constant speed. An observer standing near the sonometer hears 1 beat per second. If the speed of sound in the air is 300 ms'1 then the speed of tuning fork will be