A singer can shatter a glass by singing at a particular pitch. The correct reason for the same is :

1. The speed of sound is more in glass than in air.
2. Glass absorbs the sound waves.
3. The frequency of the singer's voice matches the natural frequency of the glass, causing resonance.
4. None of the above.

(a) Name one factor on which the frequency of sound emitted due to vibration in an air column depends.

(b) How does the frequency depend on the factor stated in part (a)?

How does the frequency of sound given by a stretched string depend on its (a) length, (b) tension?

A tuning fork is vibrating in air. State whether the vibrations are natural or damped.