Chapter - 5 Sound

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Give two practical applications of reflection of sound waves.


(i) Design of instruments like megaphone, loudspeaker, horns: These instruments are designed to send the sound in a particular direction without spreading all around. The conical opening reflects sound waves successively towards the audience. The amplitude of sound waves also adds up in these instruments that increase the loudness of a sound.

(ii) Stethoscope: It is a medical instrument used for listening to sounds in the human body mainly the heart and lungs. The sound of the heartbeats reaches the doctor’s ears by the multiple reflections of the sound wave in the rubber tube of the stethoscope.

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