Question

While watching stars Rohan found that a star is appearing blue. It is because

• A. It is as hot as Sun
• B. It is cooler than Sun
• C. It is very cold indeed
• D. It is much hotter than Sun.

Answer 1

Answer: (D)

It is much hotter than Sun.

Solution :

If Rohan found a blue-coloured star this means it's hotter than the sun because Hot stars appear blue because most energy is emitted in the bluer parts of the spectrum. There is little emission in the blue parts of the spectrum for cool stars - they appear red.

Hence the correct opt: D