GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When a police car blaring its siren is traveling towards an observer, the wavelength becomes:
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Shorter
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Longer
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Stays the same
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Nothing
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Explanation:
Detailed explanation-1: -As the car passes you, the sound waves reach you less frequently. This means that the sound is shifted towards longer wavelengths, and thus the horn sounds lower in pitch to you. A way to help remember which way the wavelengths go is to imagine that the wavelengths are a spring between two objects.
Detailed explanation-2: -Thus the siren moving towards the observer will have a higher pitch (frequency) than when it is travelling away from the same observer. Was this answer helpful?
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