Which of the following travels slowest in air and which one fastest?

Supersonic aircraft, Light, Sound

What conclusion can be obtained from the observation that when the prongs of a sound making tuning fork touch the surface of water in a beaker, the water gets splashed?

State whether the following statement is true or false:

Sound produced by a vibrating body travels to our ears by the actual movement of air.

Which term is used to denote a speed greater than the speed of sound?

In which medium sound travels faster: air or hydrogen?