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Question

In Doppler effect of light, the term "red shift" is used for _________.

A
Frequency increase
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B
Frequency decrease
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C
Wavelength decrease
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D
Frequency and wavelength increase
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Solution

The correct option is B Frequency decrease
Redshift describe how light changes as objects in space (such as stars or galaxies) move closer or farther away from us. When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer and frequency decrease.
Option B

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