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Q.

Is it true that the reflection of a sound wave is utilized in the working of megaphones and stethoscopes?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Megaphones are designed to transmit sound in a particular direction without spreading in all directions. In this instrument, a tube followed by a conical opening reflects sound successively to guide most of the sound waves from the source in the forward direction towards the audience. When these sound waves add up, the loudness of the sound increases.
A stethoscope is a medical instrument used by doctors. In stethoscopes, the sound of a patient's heartbeat is guided along the tube of the stethoscope to the doctor's ears by multiple sound reflections.
 
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