What is it that we use to calculate the speeds of distant stars and galaxies?
Correct answer: A. Doppler Effect
- A. Doppler Effect
- B. Beats
- C. Interference
- D. All of the above
Explanation
Explanation:The Doppler effect is the phenomenon where the frequency of a wave (such as light or sound) appears to change when the source or the observer is in motion relative to each other. By analysing the shift in the frequency of light emitted by a distant star or galaxy, astronomers can determine its velocity relative to Earth. Beats can be used to measure the frequency difference between the two waves, but they are not typically used in astronomical measurements. Interference can be used to study the properties of light and other waves, but it is not typically used to calculate the speeds of distant stars and galaxies.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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