Whats echo?

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Generally everyone knows that its nothing but reflection of sound.Lets see whats it in detail but briefly. 

                                                                    Matter is made up of so many particles and atoms echo is due to vibration of sound in matter. This matter vibrates and brings back the sound to our ear.

When you shout in a hollow room the sound travels away from the source(mouth) there by disturbing particles in the air and hits the wall and again reflects back. This is how sound echoes.Sound travel with 350m/s in the air. Even when the sound is vibrating away still you can hear the sound a distant away.

Its nature’s gift for having all the gas particles, dusts, matter and atoms for vibrating. If not we can’t hear sound.

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