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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
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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
- The radii of circular orbits of two satellites A and B of the earth, are 4R and R
- A high altitude, a body explodes at rest into two equal fragments with one fragment
- The half-life period of a radio-active element X is same as the mean life time
- The induced emf in a coil of 10 H inductance in which current varies
- A nucleus of mass number 220, initially at rest, emits an α-particle. If the Q-value
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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