Fill in the blank:
The colour of a star is a measure of its:

age

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temperature

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size

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distance from the Earth

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Solution

The correct option is B temperature
High temperature is sign of high energy emission.
Energy is inversely proportional to wavelength of the light emitted.
Hence, colour of the star indicates is a measure of it's temperature.
Violet coloured stars are hottest whereas red coloured stars are coldest.

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