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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
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Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
- The two ends of a metal rod are maintained at temperatures 100°C and 110°C.
- A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5).
- If an A.C. mains supply is given to be 220 V, what would be the average e.m.f.
- A glass slab consists of thin uniform layers of progressively decreasing refractive
Topics: Properties of Bulk Matter (130)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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