Question

When a tuning fork vibrates over an open pipe and the air in the pipe starts to vibrate, the vibrations in the tube are caused by

a. harmonics.
b. beats.
c. reinforcement.
d. resonance.

Answer 1

The correct answer would be d. resonance

Resonance is the phenomenon which occurs when the frequency of the forced vibrations is almost equal to the natural frequency of the system. It amplifies the sound produced by the system.

Similarly, when the tuning fork is vibrated at the natural frequency of the open pipe, the air in the pipe starts vibrating at the same frequency and results in the increased amplitude of the sound.

Answer 2

When a tuning fork vibrates over an open pipe and the air in the pipe starts to vibrate, the vibrations in the tube are caused by d. resonance. When the tuning fork vibrates near the open end of the cylinder, the sound waves from the fork are sent into the pipe. When one object vibrates, it forces another object to vibrate at the same frequency and this is called resonance