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

Subtopic:  Stefan-Boltzmann Law |
 52%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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

Subtopic:  Stefan-Boltzmann Law |
 79%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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

Subtopic:  Stefan-Boltzmann Law |
 85%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 81%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 87%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 89%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 82%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 67%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 93%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

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 |
 84%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh