The Observed Change in Wavelength Due to the Doppler Effect

question 63

Multiple Choice

The observed change in wavelength due to the Doppler effect occurs

• A) whenever the light source is moving with respect to the observer (regardless of direction).
• B) only when the light source has a radial velocity (toward or away from the observer).
• C) only when the temperature of an object changes.
• D) only when the light source has a proper motion (across the line of sight).

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