Question

The dominant colour of distant star is an indication of

• A. Size of star
• B. Distance of star from Earth
• C. Motion of star
• D. Temperature of star

Answer 1

The correct option is D Temperature of star

By Wien's law: ${\lambda }_{peak}.T=0.288\mu m.K$
where,
${\lambda }_n$= colour of wave of maximum intensity.
$T=$ temperature

The color of a star mostly indicates a star's temperature, and it can also suggest the star's age.
Like Class O stars, which are blue in color, are the hottest, and class M stars, which are red in color, are the coldest.