The increase in wavelength from the Doppler effect is called:
ADark shift
BRed shift
CBlue shift
DGrey shift
Answer & Solution
Correct answer: B. Red shift
1. A source moving away stretches the wavelength received.
2. Visible light so stretched moves towards the red end.
3. Astronomers call this a red shift.
_Source: NCERT Class 12 Physics Part II, Chapter 10, Wave Optics._
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