Assuming the sun to have a spherical outer surface of radius r

⇦

⇨

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t⁰C, the power received by a unit surface, (normal to the inicident rays) at a distance R from the centre of the sun is

Options

(a) r²σ (t + 273)⁴ / 4πR²
(b) 16 π²r² σt⁴ / R²
(c) r²σ (t + 273)⁴ / R²
(d) 4 πr² σt⁴ / R²

Correct Answer:

r²σ (t + 273)⁴ / R²

Explanation:

Power radiated by the sun at tC
= σ (t + 273)⁴ 4πr²
Power received by a unit surface
σ (t + 273)⁴ 4πr² / 4πR²
r²σ (t + 273)⁴ / R²

Related Questions:

1. The component of vector A=2i+3j along the vector i+j is
2. A deutron is bombarded on ₈O¹⁶ nucleus and α-particle is emitted. The product nucleus is
3. An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series
4. The refracting angle of a prism is A and refractive index of the material of the prism
5. Initial pressure and volume of a gas are P and 800cc. If the final volume is 100cc

Topics: Properties of Bulk Matter (130)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends