Which instrument measures the speed of rotation of a shaft? MCQ with Answer and Explanation
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The device that protects electrical circuits from overload is
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Escape velocity from a planet of mass M and radius R is v. For another planet of mass 4M and radius 2R, escape velocity is
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When an ambulance with a blaring siren moves towards an observer, the pitch of the siren appears to be higher. This is due to:
Correct Answer: Option B
Explanation:
The Doppler Effect is the apparent change in the frequency (and thus pitch) of a wave due to the relative motion between the source and the observer. As the ambulance approaches, sound waves get compressed, increasing the perceived frequency (higher pitch). As it moves away, waves stretch, lowering the frequency.
The Doppler Effect is the apparent change in the frequency (and thus pitch) of a wave due to the relative motion between the source and the observer. As the ambulance approaches, sound waves get compressed, increasing the perceived frequency (higher pitch). As it moves away, waves stretch, lowering the frequency.
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