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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Stefan-Boltzmann law
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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
(a) 1500 K            (b) 2000 K
(c) 2500 K            (d) 3000 K

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Stefan-Boltzmann law
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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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Stefan-Boltzmann law
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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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Stefan-Boltzmann law
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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 

(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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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

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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 
(a) 2                         (b) 4
(c) 8                         (d) 16

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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

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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

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Stefan-Boltzmann law
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