Question

While studying the laws of reflection of sound, Manjeet could not hear the reflected sound of the clock when one of the pipes is raised vertically up. Which law is violated?

Answer 1

The law that is violated is the second postulate of Laws of reflection, which states that the incident ray, the reflected ray and the normal at the point of incidence, all lie on the same plane.

• The laws of reflection has two postulates :

1. Angle of incidence = Angle of reflection
2. The incident sound wave, the normal and the reflected sound wave lie in the same plane.

• Manjeet could not hear the reflected sound of the clock when one of the pipes is raised vertically up because by doing this, the pipe has been shifted from the plane of the incident ray.