| ⇦ | 
| ⇨ |
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: - A photoelectric surface is illuminated successively by monochromatic light of wavelength
- The output of an AND gate is connected to both the inputs of a NOR gate,
- The minimum number of NAND gates used to construct an OR gate is
- A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden
- A susceptibility of a certain magnetic material is 400. What is the class
Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A photoelectric surface is illuminated successively by monochromatic light of wavelength
- The output of an AND gate is connected to both the inputs of a NOR gate,
- The minimum number of NAND gates used to construct an OR gate is
- A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden
- A susceptibility of a certain magnetic material is 400. What is the class
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