If the temperature of the body is increased from $$-73^{\circ}\mathrm{C}$$$\mathrm{}$ to $$327^{\circ}\mathrm{C}$$$\mathrm{}$, then the ratio of energy emitted per second in both cases is:
1. 1 : 3
2. 1 : 81
3. 1 : 27
4. 1 : 9

Subtopic:  Stefan-Boltzmann Law |
84%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If the radius of a star is $$R$$ and it acts as a black body, what would be the temperature of the star at which the rate of energy production is $$Q$$?
1. $$\frac{Q}{4\pi R^2\sigma}$$
2. $$\left(\frac{Q}{4\pi R^2\sigma}\right )^{\frac{-1}{2}}$$
3. $$\left(\frac{4\pi R^2 Q}{\sigma}\right )^{\frac{1}{4}}$$
4. $$\left(\frac{Q}{4\pi R^2 \sigma}\right)^{\frac{1}{4}}$$

Subtopic:  Stefan-Boltzmann Law |
83%
From NCERT
AIPMT - 2012
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The rate of heat emission from an ideal black body at temperature T is H. What will be the rate of emission of heat by another body of same size at temperature 2T and emissivity 0.25?

 1 16 H 2 4 H 3 8 H 4 4.5 H
Subtopic:  Stefan-Boltzmann Law |
78%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A spherical black body with a radius of 12 cm radiates 450-watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watts would be:

 1 225 2 450 3 1000 4 1800
Subtopic:  Stefan-Boltzmann Law |
74%
From NCERT
NEET - 2017
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If the sun’s surface radiates heat at $6.3×{10}^{7}$ then the temperature of the sun, assuming it to be a black body, will be:
$\left(\mathrm{\sigma }=5.7×{10}^{-8}\right)$ ${\mathrm{Wm}}^{-2}{\mathrm{K}}^{-4}$
1. $5.8×{10}^{3}$ $\mathrm{K}$
2. $8.5×{10}^{3}$ $\mathrm{K}$
3. $3.5×{10}^{8}$ $\mathrm{K}$
4. $5.3×{10}^{8}$ $\mathrm{K}$

Subtopic:  Stefan-Boltzmann Law |
59%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The temperature of an object is $$400^{\circ}\mathrm{C}$$$\mathrm{}$. The temperature of the surroundings may be assumed to be negligible. What temperature would cause the energy to radiate twice as quickly? (Given, $$2^{\frac{1}{4}} \approx 1.18$$)
1. $$200^{\circ}\mathrm{C}$$
2. 200 K
3. $$800^{\circ}\mathrm{C}$$$\mathrm{}$
4. 800 K

Subtopic:  Stefan-Boltzmann Law |
58%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Which of the following graphs correctly represents the relation between $$ln~E$$ and $$ln~T$$ where $$E$$ is the amount of radiation emitted per unit time from a unit area of a body and $$T$$ is the absolute temperature?$$\left (Take~\sigma =5.67\times 10^{-8} ~W~m^{-2}~K^{-4}~and~0<\epsilon <1 \right )$$

 1 2 3 4 Both 1 and 3
Subtopic:  Stefan-Boltzmann Law |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints