| ⇦ | 
| ⇨ |
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: - Two balls of mass m₁ and m₂ are separated from each other by powder charge
- If a small sphere is let fall vertically in a large quantity of still liquid of density
- The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He⁺ ion
- A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz.
- Two 220V – 100W bulbs are connected first in series and then in parallel.
Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two balls of mass m₁ and m₂ are separated from each other by powder charge
- If a small sphere is let fall vertically in a large quantity of still liquid of density
- The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He⁺ ion
- A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz.
- Two 220V – 100W bulbs are connected first in series and then in parallel.
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
Leave a Reply