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The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by: (where σ is Stefan’s constant)
Options
(a) σr²T⁴ / R²
(b) σr²T⁴ / 4πr²
(c) σr⁴T⁴ / r⁴
(d) 4π σr²T⁴ / R²
Correct Answer:
σr²T⁴ / R²
Explanation:
E = S / S₀ σT⁴ = 4πr² / 4πR² σT⁴
σr²T⁴ / R²
Related Questions: - If a magnet is suspended at an angle 30⁰ to the magnetic meridian, the dip needle
- The conducting loop in the form of a circle is placed in a uniform magneitc field
- Two identical circular coils A and B are kept on a horizontal tube
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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 a magnet is suspended at an angle 30⁰ to the magnetic meridian, the dip needle
- The conducting loop in the form of a circle is placed in a uniform magneitc field
- Two identical circular coils A and B are kept on a horizontal tube
- In Wheatstone bridge, three resistors P,Q and R are conncected in three arms
- The core of a transformer is laminated because
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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