Two tuning forks with natural frequencies 340 Hz each move relative to a stationary observer. One fork moves away from the observer, while the other moves towards the observer at the same speed. The observer hears beats of frequency 3 Hz. Find the speed of the tuning forks.
Show Hint
When two identical sources move symmetrically:
• Beat frequency arises due to Doppler shift.
• Use difference of apparent frequencies.
• Medium speed cancels out neatly.