Doppler would be proud, but only AFTER you show your work.
What are your thoughts? What is your plan for a solution?
A tuning fork vibrating at 512 hertz falls from rest and accelerates at 9.81 m/s^2. How far below the point of release is the tuning fork when waves of frequency 485 Hz reach the release point? take the speed of sound in air to be 340 m/s. (don't forget it takes the sound extra time to reach the release point)