The figure shows a system of two concentric spheres of radii r1 and r2 and kept at temperatures T1 and T2, respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to -

(a) r1r2r1-r2
(b) r1-r2
(c) r1-r2r1r2
(d) In r2r1

Subtopic:  Conduction |
 66%
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The graph shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity (e) and absorptivity (a) of the two bodies .

(1) ex>ey & ax<ay

(2) ex<ey & ax>ay

(3) ex>ey & ax>ay

(4) ex<ey & ax<ay

Subtopic:  Radiation |
 56%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The plots of intensity versus wavelength for three black bodies at temperatures \(T_1, T_2 ~\text{and}~T_3\) respectively are as shown. Their temperature are such that:

1. \(T_1>T_2>T_3\)
2. \(T_1>T_3>T_2\)
3. \(T_2>T_3>T_1\)
4. \(T_3>T_2>T_1\)

Subtopic:  Wien's Displacement Law |
 61%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The adjoining diagram shows the spectral energy density distribution \(E_{\lambda}\) of a black body at two different temperatures. If the areas under the curves are in the ratio \(16:1,\) the value of temperature \(T\) is: 

  
1. \(32000\) K
2. \(16000\) K
3. \(8000\) K
4. \(4000\) K

Subtopic:  Stefan-Boltzmann Law |
 57%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Variation of radiant energy emitted by sun, filament of tungsten lamp and welding arc as a function of its wavelength is shown in figure. Which of the following option is the correct match?

                             

(1) Sun-T1, tungsten filament-T2 welding arc -T3
(2) Sun-T2, tungsten filament-T1, welding arc- T3
(3) Sun-T3, tungsten filament-T2 welding arc-T1 
(4) Sun-T1, tungsten filament-T3, welding arc-T2

Subtopic:  Wien's Displacement Law |
 72%
From NCERT
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Shown below are the black body radiation curves at temperatures T1 and T2 (T2>T1). Which of the following plots is correct ?

Subtopic:  Wien's Displacement Law |
 61%
From NCERT
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The spectrum of a black body at two temperatures 27°C and 327°C is shown in the figure. Let A1 and A2 be the areas under the two curves respectively. The value of A2A1 is


(a) 1 : 16

(b) 4 : 1

(c) 2 : 1

(d) 16 : 1

Subtopic:  Stefan-Boltzmann Law |
 60%
From NCERT
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A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling?

1. 2.
3. 4.
Subtopic:  Newton's Law of Cooling |
 78%
From NCERT
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The energy distribution E with the wavelength λ for the black body radiation at temperature T Kelvin is shown in the figure. As the temperature is increased the maxima will:
     

1. Shift towards left and become higher
2. Rise high but will not shift
3. Shift towards right and become higher
4. Shift towards left and the curve will become broader

Subtopic:  Wien's Displacement Law |
 62%
From NCERT
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For a small temperature difference between the body and the surroundings, the relation between the rate of loss heat \(R\) and the temperature of the body \(\theta\) is depicted by:

1. 2.
3. 4.
Subtopic:  Conduction |
From NCERT
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