The temperature of an object is \(400^{\circ}\mathrm{C}\). 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. \(800^{\circ}\mathrm{C}\)         
4. 800 K

Subtopic:  Stefan-Boltzmann Law |
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A black body at a temperature of 227°C radiates heat energy at the rate of 5 cal/cm2-sec. At a temperature of 727°C, the rate of heat radiated per unit area in cal/cm2 will be 
(1) 80                     

(2) 160

(3) 250                   

(4) 500

Subtopic:  Stefan-Boltzmann Law |
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Energy is being emitted from the surface of a black body at 127°C temperature at the rate of 1.0×106 J/sec-m2. Temperature of the black body at which the rate of energy emission is 16.0×106 J/sec-m2 will be -

(a) 254°C          (b) 508°C
(c) 527°C          (d) 727°C

Subtopic:  Stefan-Boltzmann Law |
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If temperature of a black body increases from 7°C to 287°C , then the rate of energy radiation increases by

(a) 28774                  (b) 16
(c) 4                            (d) 2

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The area of a hole of heat furnace is 10-4 m2. It radiates 1.58×105 calories of heat per hour. If the emissivity of the furnace is 0.80, then its temperature is
(1) 1500 K           

(2) 2000 K

(3) 2500 K           

(4) 3000 K

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Two spheres P and Q, of same colour having radii 8 cm and 2 cm are maintained at temperatures 127°Cand 527°C respectively. The ratio of energy radiated by P and Q is 
(a) 0.054             (b) 0.0034
(c) 1                   (d) 2

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A body radiates energy 5W at a temperature of 127°C. If the temperature is increased to 927°C, then it radiates energy at the rate of
(a) 410 W                   (b) 81 W 
(c) 405 W                   (d) 200 W

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The temperatures of two bodies A and B are respectively 727°C and 327°C. The ratio of the rates of heat radiated by them is 

(1)727:327                       

(2) 5 : 3

(3) 25 : 9                           

(4) 625 : 81

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The radiant energy from the sun incident normally at the surface of earth is 20 kcal/m2min. What would have been the radiant energy incident normally on the earth, if the sun had a temperature twice of the present one ?

(a) 160 kcal/m2min                    (b) 40 kcal/m2min
(c) 320 kcal/m2min                    (d) 80 kcal/m2min

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A spherical black body with a radius of 12 cm radiates 440 W power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be

(1) 225                     

(2) 450

(3) 900                     

(4) 1800

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