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

Subtopic:  Stefan-Boltzmann Law |
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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

Subtopic:  Stefan-Boltzmann Law |
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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

Subtopic:  Stefan-Boltzmann Law |
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If the temperature of the sun (black body) is doubled, the rate of energy received on earth will be increased by a factor of 
(1) 2                         

(2) 4

(3) 8                         

(4) 16

Subtopic:  Stefan-Boltzmann Law |
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The ratio of energy of emitted radiation of a black body at 27°C and 927°C is
(a) 1 : 4                  (b) 1 : 16
(c) 1 : 64                 (d) 1 : 256

Subtopic:  Stefan-Boltzmann Law |
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Two spherical black bodies of radii r1 and r2 and with surface temperature T1 and T2 respectively radiate the same power. Then the ratio of r1 and r2 will be

(a) T2T12                (b) T2T14
(c) T1T22                (d) T1T24

Subtopic:  Stefan-Boltzmann Law |
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A black body is at a temperature 300 K. It emits energy at a rate, which is proportional to

(a) 300             (b) 3002 
(c) 3003         (d)  3004

Subtopic:  Stefan-Boltzmann Law |
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Two identical metal balls at temperature 200°C and 400°C kept in air at 27°C. The ratio of net heat loss by these bodies is 
(1) 1/4     
           
(2) 1/2

(3) 1/16   
           
(4) 4734-30046734-3004 

Subtopic:  Stefan-Boltzmann Law |
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The radiation emitted by a star A is 10,000 times that of the sun. If the surface temperatures of the sun and the star A are 6000 K and 2000 K respectively, the ratio of the radii of the star A and the sun is 
1. 300 : 1                     

2. 600 : 1

3. 900 : 1                     

4. 1200 : 1

Subtopic:  Stefan-Boltzmann Law |
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Star A has radius r surface temperature T while star B has radius 4r and surface temperature T/2. The ratio of the power of two stars, PA:PBis 
(1) 16 : 1                           

(2) 1 : 16

(3) 1 : 1                             

(4) 1 : 4

Subtopic:  Stefan-Boltzmann Law |
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