Which of the Following Is a Plausible Example of a Doppler

question 34

Multiple Choice

Which of the following is a plausible example of a Doppler blueshift?

• A)A star appears to have a much higher temperature when moving toward the Earth than when moving away.
• B)An ambulance's siren changes to a higher pitch as it speeds toward you.
• C)A star's colour becomes redder as it moves away from the Earth.
• D)A moving train's whistle shifts to a frequency so high that humans can't hear it.

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