When the light source is approaching, the Doppler effect for light is known as:

Red Shift

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Purple Shift

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Maroon Shift

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Blue Shift

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Solution

The correct option is C Blue Shift
Optical light with a short wavelength is blue. When the wavelength of the light gets shortened by Doppler effect, we refer to the change in the wavelength as blue shift.

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0.8 C

5000 ˚ A

A light source approaches the observer with velocity 0.8C. The Doppler shift of or light of the wavelength $5500 0 A$ is:

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