The amount of radiation emitted by a perfectly black body is proportional to 

(1) Temperature on ideal gas scale

(2) Fourth root of temperature on ideal gas scale

(3) Fourth power of temperature on ideal gas scale

(4) Source of temperature on ideal gas scale

Subtopic:  Stefan-Boltzmann Law |
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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

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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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