Which of the following is the example of ideal black body ?

(1) Kajal                                 

(2) Black board

(3) A pin hole in a box             

(4) None of these

Subtopic:  Radiation |
 61%
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Which of the following law states that “good absorbers of heat are good emitters”  ?
(1) Stefan’s law               

(2) Kirchoff’s law

(3) Planck’s law               

(4) Wein’s law

Subtopic:  Stefan-Boltzmann Law |
 67%
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According to Wein's law:
1. λmT= constant                 

2. λmT= constant

3. Tλm= constant                 

4. T+λm= constant

Subtopic:  Wien's Displacement Law |
 92%
From NCERT
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On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that

(1) The temperature of A is maximum, B is minimum and C is intermediate

(2) The temperature of A is maximum, C is minimum and B is intermediate

(3) The temperature of B is maximum, A is minimum and C is intermediate

(4) The temperature of C is maximum, B is minimum and A is intermediate

Subtopic:  Wien's Displacement Law |
 76%
From NCERT
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The wavelength of radiation emitted by a body depends upon 

(1) The nature of its surface

(2) The area of its surface

(3) The temperature of its surface

(4) All the above factors

Subtopic:  Wien's Displacement Law |
 66%
From NCERT
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If black wire of platinum is heated, then its colour first appear red, then yellow and finally white. It can be understood on the basis of 

(1) Wien's displacement law

(2) Prevost theroy of heat exchange

(3) Newton's law of cooling

(4) None of the above

Subtopic:  Wien's Displacement Law |
 90%
From NCERT
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Colour of shining bright star is an indication of its

(1) Distance from the earth             

(2) Size

(3) Temperature                             

(4) Mass

Subtopic:  Wien's Displacement Law |
 85%
From NCERT
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A black body at \(200\) K is found to emit maximum energy at a wavelength of \(14\) \(\mu \)m. When its temperature is raised to \(1000\) K, the wavelength at which maximum energy is emitted will be:

1. \(14\) \(\mu \)m 2. \(70\) \(\mu \)m
3. \(2.8\) \(\mu \)m 4. \(2.8\) nm
Subtopic:  Wien's Displacement Law |
 86%
From NCERT
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If the temperature of the sun becomes twice its present temperature, then:

1. Radiated energy would be predominantly in the infrared range.
2. Radiated energy would be primarily in the ultraviolet range.
3. Radiated energy would be predominantly in the X-ray region
4. Radiated energy would become twice as strong as it is now.


 

Subtopic:  Wien's Displacement Law |
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The maximum energy in the thermal radiation from a hot source occurs at a wavelength of 11×10-5 cm. According to Wein's law, the temperature of the source (on Kelvin scale) will be n times the temperature of another source (on Kelvin scale) for which the wavelength at maximum energy is 5.5×10-5 cm. The value n is 
(a) 2                     (b) 4
(c) 12                    (d) 1

Subtopic:  Wien's Displacement Law |
 62%
From NCERT
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