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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 concentric spheres of radii R and r have positive charges q₁ and q₂ with equal
- For a satellite escape velocity is 11 kms⁻¹.If the satellite is launched at an angle
- A parallel plate capacitor has 91 plates, all are identical and arranged with same
- If the cold junction of a thermo-couple is kept at 0⁰C and the hot junction is kept
- Two forces of magnitude 8N and 15N respectively act at a point so as to make the resultant force
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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