| ⇦ | 
| ⇨ |
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: - Weight of a body of mass m decreases by 1% when it is raised to height h
- Two small spherical shells A and B are given positive charges of 9C and 4C
- The magnetic field at a point on the axis of a long solenoid having 5 turns per cm
- If the image formed by a convex mirror of focal length 30 cm is a quarter of the size
- The rms current in an AC circuit is 2 A. If the wattless current be √3 A,
Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Weight of a body of mass m decreases by 1% when it is raised to height h
- Two small spherical shells A and B are given positive charges of 9C and 4C
- The magnetic field at a point on the axis of a long solenoid having 5 turns per cm
- If the image formed by a convex mirror of focal length 30 cm is a quarter of the size
- The rms current in an AC circuit is 2 A. If the wattless current be √3 A,
Topics: Properties of Bulk Matter (130)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply