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A star emits light of 5500 Å wavelength. It appears blue to an observer on the earth, it means (Blue radiations have the wavelength around 4600 $\overset{o}{A}$ .)

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Star is going away from the earth

Star is stationary

Star is coming towards earth.

may be moving towards or may be away.

answer is C.

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Detailed Solution

Blue radiations have the wavelength around 4600 $\overset{o}{A}$ . It shows that apparent wavelength is smaller than the real wavelength. It means that the star is proceeding towards earth.

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