A stationary observer receives sonic oscillations from two tuning forks, one of which approaches and the other recedes with same speed. As this takes place the observer hears the *** frequency of 2 Hz. Find the speed of each tuning fork, if their oscillation frequency is 680 Hz and the velocity of sound in air is 340 m/. [ Use g = 10 m/s2 ]
(A) 1 m/*
(B) 2 m/*
(C) 0.5 m/*
(D) 1.5 m/*
