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33. Multiple choice question XXXIII

1. You must have seen the doctor checking the sounds produced in the chest or heartbeat of a patient using a medical instrument called Stethoscope. On what principle does this Stethoscope work?

Multiple refractions
Multiple reflections
Wave motion
None of these

2. The frequency of a source is \(20\ kHz\). The frequencies of the sound waves produced by it in water and air will

Be the same as that of the source
Depend upon the velocity of the waves in these media
Depend upon the wavelength of the waves in these media
Depend upon the density of the media

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