Why does a tuning fork have two prongs?

A tuning fork has two prongs.Why?

What is the use of having two prongs of a tuning fork ? If one of the prongs is cut off, would the tuning fork be of any use ?

Questions based on paragraph : Sound is propagated in a material medium in the form of compression and rarefactions. One compression and one rarefaction together form one cycle of the sound wave. The number of cycles produced per second is called as frequency. A tuning fork is a two-pronged device which vibrates to produce sound when struck. The frequency of a tuning fork is decided by the dimensions of the prong and the material used for making the fork. When these sound waves reach ears of listener, his ear-drum vibrates. Accordingly specific signals are conveyed to the brain and the listener gets a sense of hearing sound. : Will two tuning forks of same dimensions but different material produce same type of sound when struck with the same force?

When a little wax is put on the prongs of a tuning fork, then the frequency of vibration of a tuning fork will

When prongs of a tuning fork are rubbed, its frequency decreases.

When two tuning forks are vibrated together, 6 beats are produced per second. If one of the prongs of the tuning fork of frequency 400 Hz is made slightly heavier, the number of beats per second decreases. What is the frequency of the other tuning fork ?