InterviewSolution
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InterviewSolution
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(i) What is mean by reflection of sound? |
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Answer» SOLUTION :When sound waves travel in a given medium and strike the surface of another medium, it can be bounced back into the FIRST medium is called as reflection (ii) Explain the REFRACTION at the boundary of a rarer and denser medium? (a) Reflection in rarer medium • Consider a wave travelling in a solid medium striking on the interface between the solid and the air. • The compression exerts a force F on the surface of the rarer medium. • As a rarer medium has smaller resistance for any deformation, the surface of separation is pushed backwards. . As the particle of the rarer medium are free to move, a rarefaction is produced at the interface. THUS, a compression is reflected as a rarefaction and the RARE faction travels from right to left. (b) Reflection in denser medium: Incident Wave • A longitudinal wave travels in a medium in the · form of compressions and rarefactions. • Suppose a compression travelling in air from left to right reaches a rigid wall. • In turn, the wall exerts an equal and opposite reaction R--Fon the air molecules. This results in a compression near the rigid wall. • Thus, a compression travelling towards the rigid wall is reflected back as a compression. That is the direction of compression is reversed. 
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