The colour of a star indicates its

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temperature

velocity

size

length

answer is A.

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Detailed Solution

From Wien's displacement law, we haveλmT = constantwhere λm is maximum wavelength, T is absolute temperature. That means, as the temperature of the black body rises, the maximum energy emitted shifts towards shorter wavelength. Hence, star appearing reddish has the lowest temperature and that appearing bluish has the highest temperature.

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