Q26.If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be (1) 4 (2) 16 (3) 32 (4) 64
What This Question Tests
This question applies the Stefan-Boltzmann Law to calculate the change in radiated power when both the temperature and radius of a radiating body change.
Concepts Tested
Formulas Used
P = σAT⁴ = σ(4πR²)T⁴
📚 NCERT Sections This Tests
2.4 — A Spherical Conductor Of Radius 12 Cm Has A Charge Of 1.6 × 10–7C
Physics Class 11 · Chapter 2
2.4 A spherical conductor of radius 12 cm has a charge of 1.6 × 10–7C distributed uniformly on its surface. What is the electric field (a) inside the sphere (b) just outside the sphere (c) at a point 18 cm from the centre of the sphere?
12.7 — The Radius Of The Innermost Electron Orbit Of A Hydrogen Atom Is
Physics Class 12 · Chapter 12
12.7 The radius of the innermost electron orbit of a hydrogen atom is 5.3×10–11 m. What are the radii of the n = 2 and n =3 orbits?
1.19 — A Point Charge Causes An Electric Flux Of –1.0 × 103 Nm2/C To Pass
Physics Class 11 · Chapter 1
1.19 A point charge causes an electric flux of –1.0 × 103 Nm2/C to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge. (a) If the radius of the Gaussian surface were doubled, how much flux would pass through the surface? (b) What is the value of the point charge?
📋 Question Details
- Chapter
- Thermodynamics & KTG
- Topic
- Thermal Radiation (Stefan-Boltzmann Law)
- Year
- 2004
- Shift
- Unknown
- Q Number
- Q26
- Type
- MCQ
- NCERT Ref
- Class 11 Physics Ch 11: Thermal Properties of Matter
More from this Chapter
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Q27.Two spheres of the same material have radii 1 m and 4 m and temperatures 4000 K and 2000 K respectively. The ratio of the energy radiated per second by the first sphere to that by the second is (1) 1 : 1 (2) 16 : 1 (3) 4 : 1 (4) 5 : 3
Q29.Which statement is incorrect? (1) all reversible cycles have same efficiency (2) reversible cycle has more efficiency than an irreversible one (3) Carnot cycle is a reversible one (4) Carnot cycle has the maximum efficiency in all cycles