A star emits light of 5500 wavelength. Its appearsblue to an observer on the earth, it means[DPMT 2002]

Blue radiations have the wavelength around 4600Å. It shows that apparent wavelength is smaller than the real wavelength. It means that the star is proceeding towards earth.

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A star emits light of 5500 wavelength. Its appearsblue to an observer on the earth, it means[DPMT 2002]

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