The motion of the prongs of the sounding tuning fork is
Answer Details
The motion of the prongs of a sounding tuning fork is vibratory. When the prongs are struck or set into vibration, they oscillate back and forth in opposite directions, creating a series of compressions and rarefactions in the surrounding air molecules. This causes the air molecules to vibrate and propagate sound waves through the air, which we perceive as sound. The vibratory motion of the prongs is what sets up the sound wave, which is why tuning forks are often used as a reference pitch for tuning musical instruments.