Doppler Effect (source Moving)
Source approaches stationary observer. Observed frequency?
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About This Question
- Subject
- physics
- Chapter
- oscillations and waves
- Topic
- doppler effect (source moving)
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Increases
- Doppler Effect: The change in observed frequency due to the relative motion between the source and the observer.
- Physical Mechanism: As the source moves toward the observer, each successive wave crest is emitted from a position closer to the observer than the previous one.
- Wavelength Compression: This effectively 'squeezes' the waves, reducing the apparent wavelength (λ′=λ−vs/f).
- Frequency Shift: Since v=f′λ′, a smaller wavelength leads to a higher frequency (f′>f).
- Formula: f′=f(v−vsv), where v is the speed of sound and vs is the source speed toward the observer.
This medium difficulty physics question is from the chapter oscillations and waves, covering the topic of doppler effect (source moving). It appeared in the 2025 exam.
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