Answer to Question #146013 in Astronomy | Astrophysics for Abdul Salam

Question #146013

When the Sun was a protostar, it had a maximum luminosity about 1000 times its present luminosity and a surface temperature about 1000K. What was its radius? Assume that the star radiates like a blackbody.

Expert's answer

L=4\pi R^2\sigma T^4\\\frac{L'}{L}=\frac{R'^2T^4}{R^2T'^4}\\1000=\frac{R'^2(5800)^4}{(696 340\cdot10^3)^2(1000)^4}\\R'=2.22\cdot10^8\ m

Learn more about our help with Assignments: Astronomy

Comments

No comments. Be the first!

Leave a comment

Related Questions

1. .The two stars in a binary system have an orbital period of 5 years and an orbital separation, a, of
2. In a model of the universe, the Hubble parameter has the following functional form H(z) = H0(1 + z)^
3. Inflation theory predicts that even the most distant observable parts of the universe should have ve
4. The big rip theory suggest the possibility of the universe being ripped apart by the force of dark e
5. Do particles(including all the quarks and other elementary particles) creating themselves and annihi
6. All the 4 fundamental forces of nature are a by-product of the big bang, (Gravity and the 2 nuclear
7. It’s said that everything before the big bang was packed in a super-dense tiny atom size position,