C.5 Doppler effect Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. A galaxy's spectral lines are shifted to shorter wavelengths. It is:
- A. Receding
- B. Approaching
- C. Stationary
- D. Expanding
2. Which is unchanged when an observer moves towards a stationary sound source?
- A. Frequency heard
- B. Wavelength in the air
- C. Relative speed of the waves
- D. Pitch
3. HL: A 500 Hz source moves at 40 m s⁻¹ towards a stationary listener (v = 340 m s⁻¹). The frequency heard is about:
- A. 447 Hz
- B. 559 Hz
- C. 567 Hz
- D. 500 Hz
4. HL: A listener moves at 40 m s⁻¹ towards a stationary 500 Hz source (v = 340 m s⁻¹). The frequency heard is about:
- A. 441 Hz
- B. 559 Hz
- C. 567 Hz
- D. 500 Hz
5. HL: In the moving-source equation, which sign is used in the denominator when the source recedes?
- A. v − us
- B. v + us
- C. v × us
- D. v/us