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 

(a)727:327                        (b) 5 : 3
(c) 25 : 9                           (d) 625 : 81

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Stefan-Boltzmann law
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The energy emitted per second by a black body at 27°C is 10 J. If the temperature of the black body is increased to 327°C, the energy emitted per second will be

(a) 20 J              (b) 40 J
(c) 80 J              (d) 160 J

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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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If the temperature of the sun (black body) is doubled, the rate of energy received on earth will be increased by a factor of 
(a) 2                         (b) 4
(c) 8                         (d) 16

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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

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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

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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

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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 
(a) 1/4                  (b) 1/2
(c) 1/16                (d) 4734-30046734-3004 

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A black body radiates 20 W at temperature 227°C. If temperature of the black body is changed to 727°C then its radiating power will be

(a) 120W                  (b) 240 W
(c) 320 W                 (d) 360 W

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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 
(a) 300 : 1                     (b) 600 : 1
(c) 900 : 1                     (d) 1200 : 1

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