What is sound? How is it generated? How does it travel? Can sound waves travel in a vacuum?
a)Sound is a form of energy produced and transmitted by vibrating matter.Material medium is required for the sound wave propagation.
b) Sound waves are always generated when an object or medium vibrates.
Sound travels in waves. When sound moves through matter (solid, liquid, or a gas), the molecules of the matter move backward and forward in the direction in which the wave is traveling. This movement is called a vibration.