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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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- An electric dipole is placed at an angle 30°with an electric field intensity 2×10⁵N/C.
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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
- A beam of electron passes undeflected through mutually perpendicular
- An electric dipole is placed at an angle 30°with an electric field intensity 2×10⁵N/C.
- An α-particle of energy 5 MeV is scattered through 180⁰ by a fixed uranium nucleus.
- If L and C denote inductance and capacitance,then the dimensions of L-C are
- A 1 µA beam of protons with a cross-sectional area of 0.5 sq.mm is moving with a velocity
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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