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JEE Main 2022 Physics question

PhysicsWavesJEE Main 2022

For a specific wavelength 670 nm of light from a galaxy moving with velocity v, the observed wavelength is 670.7 nm. The value of v is

Answer: (3)

Solution

By the Doppler effect for v ≪ c, + v/c. So

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Question ID VK-025209