Question

20. Which of the following is responsible
for the production of an echo?
(1) Absorption of sound waves
(2) Reflection of sound waves
(3) Refraction of sound waves
(4) Transmission of sound waves​

Answer 1

Answer:

option 2

(2) Reflection of sound waves

Answer 2

The production of an echo is responsible for Reflection of sound waves.

• The reflection of sound follows the law "angle of incidence equals angle of reflection", sometimes called the law of reflection.
• one sound source is required,one plane of reflection is required and after reflecting the sound wave will reach to its destination.
• angle of incidence is equals to angle of reflection.
• A imaginary vertical plane helps to determine the angles between incident sound wave and the reflected sound wave.