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Emissive and Absorptive Power

The brightnes...

Question

The brightness of a star depends on its __________.

A

size and temperature

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B

size and distance from the Earth

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C

size, temperature and mass

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D

size, temperature and distance from the Earth

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Solution

The correct option is A size and temperature
Power radiated by a star $P = σ A e T^{4}$
More is the power radiated, more is the brightness of star.
So more is the area and temperature of star, more is the power radiated and hence more is the brightness.

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