Question

State the condition for an echo to be heard

Answer 1

echo is a type of wave . when there is situation where there is hilly area then when you say something that will be converted into waves that enhance the air particles move and collide another then they hit any object they will refelect back causing again a motion that will hear again and again

Answer 2

Echo is actually heard at a hill tops or in an auditorium. It is a type of wave which reflects continuously in a room a multiple times. It is an echo