Define megaphone , strethoscope and infrasonic sound
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infrasonic sound waves are sound waves which have high frequency than the normal and it can be only heard by animals not by humans.
stethoscope is instrument which is used by Doctors to check heartbeat and ratings of heart
stethoscope is instrument which is used by Doctors to check heartbeat and ratings of heart
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1. Megaphone- A portable hand-held Funnel shaped device that is used to amplify a person's natural voice towards a targeted direction.
2. Strethoscope- it is an acoustic medical device for auscultation for listening to the internal sound of an animal or human body.
3. Infrasonic- having frequencies below the human audible range...
2. Strethoscope- it is an acoustic medical device for auscultation for listening to the internal sound of an animal or human body.
3. Infrasonic- having frequencies below the human audible range...
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