GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increase
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decrease
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Either A or B
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None of the above
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Detailed explanation-1: -When an ambulance passes with its siren blaring, you hear the pitch of the siren change: as it approaches, the siren’s pitch sounds higher than when it is moving away from you. This change is a common physical demonstration of the Doppler effect.
Detailed explanation-2: -So, the ambulance, and observer both are stationary. So, it indicates that the wavelength or frequency because of the doppler effect does not change. Hence, the frequency of the heard sound is equal to the frequency of emitted sound by the siren. Thus, the frequency of the heard sound is 2550 Hz.
Detailed explanation-3: -The pitch will sound lower. Explanation: The Doppler effect states that the frequency of sound increases as it approaches you and decreases as it goes away from you. Since it is going away from you, the pitch of the sound will appear to get lower.