JEE Main & Advanced Physics Transmission of Heat Question Bank

done Radiation Wein's law Total Questions - 30

• question_answer1)
  According to Wein's law [DCE 1995, 96; MP PET/PMT 1988 DPMT 1999; AIIMS 2002; CBSE PMT 2004]
  A)
             \[{{\lambda }_{m}}T\]= constant                                     done clear
  B)
             \[\frac{{{\lambda }_{m}}}{T}\]= constant done clear
  C)
             \[\frac{T}{{{\lambda }_{m}}}\]= constant                     done clear
  D)
                                         \[T+{{\lambda }_{m}}\]= constant done clear
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• question_answer2)
  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 [CPMT 1989]
  A)
             The temperature of A is maximum, B is minimum and C is intermediate done clear
  B)
             The temperature of A is maximum, C is minimum and B is intermediate done clear
  C)
             The temperature of B is maximum, A is minimum and C is intermediate done clear
  D)
             The temperature of C is maximum, B is minimum and A is intermediate done clear
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• question_answer3)
  If wavelengths of maximum intensity of radiations emitted by the sun and the moon are \[0.5\times {{10}^{-6}}m\] and \[{{10}^{-4}}m\] respectively, the ratio of their temperatures is [MP PMT 1990]
  A)
             1/100                                        done clear
  B)
             1/200 done clear
  C)
             100 done clear
  D)
             200 done clear
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• question_answer4)
  The wavelength of radiation emitted by a body depends upon                                  [MP PMT 1992]
  A)
             The nature of its surface done clear
  B)
             The area of its surface done clear
  C)
             The temperature of its surface done clear
  D)
             All the above factors done clear
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• question_answer5)
  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                                                           [MP PMT 1984]
  A)
             Wien's displacement law done clear
  B)
             Prevost theory of heat exchange done clear
  C)
             Newton's law of cooling done clear
  D)
             None of the above done clear
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• question_answer6)
  Colour of shining bright star is an indication of its [AIIMS 2001; RPMT 1999; BCECE 2005]
  A)
             Distance from the earth   done clear
  B)
             Size done clear
  C)
             Temperature                        done clear
  D)
             Mass done clear
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• question_answer7)
  The wavelength of maximum emitted energy of a body at 700 K is 4.08 \[\mu m\]. If the temperature of the body is raised to 1400 K, the wavelength of maximum emitted energy will be                                                     [MP PET 1990]
  A)
             \[1.02\ \mu m\]                   done clear
  B)
             16.32\[\mu m\] done clear
  C)
             8.16\[\mu m\]                      done clear
  D)
             2.04\[\mu m\] done clear
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• question_answer8)
  A black body at 200 K is found to exit maximum energy at a wavelength of \[14\mu m\]. When its temperature is raised to 1000K, the wavelength at which maximum energy is emitted is               [RPMT 1998; MP PET 1991; BVP 2003]
  A)
             \[14\mu m\]                         done clear
  B)
             \[70\mu F\] done clear
  C)
             \[2.8\mu m\] done clear
  D)
             \[2.8mm\] done clear
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• question_answer9)
  Two stars emit maximum radiation at wavelength 3600\[{AA}\] and 4800\[{AA}\] respectively. The ratio of their temperatures is [MP PMT 1991]
  A)
  1 : 2                                           done clear
  B)
  3 : 4 done clear
  C)
  4 : 3                                           done clear
  D)
  2 : 1 done clear
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• question_answer10)
  A black body emits radiations of maximum intensity at a wavelength of \[5000{AA}\], when the temperature of the body is \[{{1227}^{o}}C\]. If the temperature of the body is increased by \[{{1000}^{o}}C\], the maximum intensity of emitted radiation would be observed at                                                               [MP PET 1992]
  A)
  \[2754.8{AA}\]                   done clear
  B)
  \[3000{AA}\] done clear
  C)
  \[3500{AA}\]                       done clear
  D)
  \[4000{AA}\] done clear
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• question_answer11)
  Four pieces of iron heated in a furnace to different temperatures show different colours listed below. Which one has the highest temperature                                        [MP PET 1992]
  A)
             White                                       done clear
  B)
             Yellow done clear
  C)
             Orange                                    done clear
  D)
             Red done clear
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• question_answer12)
  If a black body is heated at a high temperature, it seems to be                                                   [DPMT 2001]
  A)
             Blue                                          done clear
  B)
             White done clear
  C)
             Red                                           done clear
  D)
             Black done clear
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• question_answer13)
  If the temperature of the sun becomes twice its present temperature, then      [MP PET 1989; RPMT 1996]
  A)
             Radiated energy would be predominantly in infrared done clear
  B)
             Radiated energy would be predominantly in ultraviolet done clear
  C)
             Radiated energy would be predominantly in X-ray region done clear
  D)
             Radiated energy would become twice the present radiated energy done clear
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• question_answer14)
  The maximum energy in the thermal radiation from a hot source  occurs at a wavelength of \[11\times {{10}^{-5}}cm\]. 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 \[5.5\times {{10}^{-5}}cm\].  The value \[n\] is                                            [CPMT 1991]
  A)
             2     done clear
  B)
             4 done clear
  C)
             \[\frac{1}{2}\]                       done clear
  D)
             1 done clear
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• question_answer15)
  The wavelength of maximum energy released during an atomic explosion was \[2.93\times {{10}^{-10}}m\]. Given that Wein's constant is \[2.93\times {{10}^{-3}}m-K\], the maximum temperature attained must be of the order of [Haryana CEE 1996; MH CET 2002; Pb. PET 2000]
  A)
             \[{{10}^{-7}}K\]                    done clear
  B)
             \[{{10}^{7}}K\] done clear
  C)
             \[{{10}^{-13}}K\]                 done clear
  D)
             \[5.86\times {{10}^{7}}K\] done clear
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• question_answer16)
  The maximum wavelength of radiation emitted at \[2000\ K\]is \[4\mu m\]. What will be the maximum wavelength of radiation emitted at                [MP PMT/PET 1998; DPMT 2000]
  A)
             \[3.33\ \mu m\]                   done clear
  B)
             \[0.66\ \mu m\] done clear
  C)
             \[1\ \mu m\]                         done clear
  D)
             \[1\ m\] done clear
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• question_answer17)
  How is the temperature of stars determined by  [BHU 1999, 02; DCE 2000, 03]
  A)
             Stefan?s law                          done clear
  B)
             Wein?s displacement law done clear
  C)
             Kirchhoff?s law                     done clear
  D)
             Ohm?s law done clear
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• question_answer18)
  On increasing the temperature of a substance gradually, which of the following colours will be noticed by you [Pb. PMT 1995; Pb. PET 1996; CPMT 1995, 98; KCET 2000]
  A)
              White                                      done clear
  B)
              Yellow  done clear
  C)
              Green                                     done clear
  D)
              Red       done clear
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• question_answer19)
  A black body has maximum wavelength \[{{\lambda }_{m}}\] at temperature 2000 K.  Its corresponding wavelength at temperature 3000 K  will be [CBSE PMT 2001; Kerala PET 2005]
  A)
             \[\frac{3}{2}{{\lambda }_{m}}\]                                        done clear
  B)
             \[\frac{2}{3}{{\lambda }_{m}}\] done clear
  C)
             \[\frac{4}{9}{{\lambda }_{m}}\]                                        done clear
  D)
             \[\frac{9}{4}{{\lambda }_{m}}\] done clear
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• question_answer20)
  Relation between the colour and the temperature of a star is given by                                                   [Kerala PET 2001]
  A)
             Wein?s displacement law done clear
  B)
             Planck?s law done clear
  C)
             Hubble?s law done clear
  D)
             Fraunhofer diffraction law done clear
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• question_answer21)
  A black body at a temperature of 1640 K has the wavelength corresponding to maximum emission equal to 1.75\[\mu \]. Assuming the moon to be a perfectly black body, the temperature of the moon, if the wavelength corresponding to maximum emission is 14.35 m is [Kerala (Med.) 2002]
  A)
             100 K                                        done clear
  B)
             150 K done clear
  C)
             200 K                                        done clear
  D)
             250 K done clear
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• question_answer22)
  The maximum wavelength of radiations emitted at 900 K is \[4\mu m\]. What will be the maximum wavelength of radiations emitted at 1200 K                                       [BHU 2002]
  A)
             \[3\mu m\]                            done clear
  B)
             \[0.3\mu m\] done clear
  C)
             \[1\mu m\]                            done clear
  D)
             \[1\,\,m\] done clear
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• question_answer23)
  Solar radiation emitted by sun resembles that emitted by a black body at a temperature of 6000 K. Maximum intensity is emitted at a wavelength of about 4800Å. If the sun were to cool down from 6000 K to 3000 K  then the peak intensity would occur at a wavelength    [UPSEAT 2002]
  A)
             4800Å                                       done clear
  B)
             9600Å done clear
  C)
             7200Å                                       done clear
  D)
             6400Å done clear
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• question_answer24)
  What will be the ratio of temperatures of sun and moon if the wavelengths of their maximum emission radiations rates are 140 Å and 4200 Å respectively                                                 [J & K CET 2004]
  A)
             1 : 30                                         done clear
  B)
             30 : 1 done clear
  C)
             42 : 14                                      done clear
  D)
             14 : 42 done clear
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• question_answer25)
  The radiation energy density per unit wavelength at a temperature T has a maximum at a wavelength l0. At temperature \[2T\], it will have a maximum at a wavelength [UPSEAT 2004]
  A)
             4l0 done clear
  B)
             2l0 done clear
  C)
             l0/2                                          done clear
  D)
             l0/4 done clear
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• question_answer26)
  The absolute temperatures of two black bodies are 2000 K and 3000 K respectively. The ratio of wavelengths corresponding to maximum emission of radiation by them will be                                             [RPMT 2003]
  A)
             2 : 3                                           done clear
  B)
             3 : 2 done clear
  C)
             9 : 4                                           done clear
  D)
             4 : 9 done clear
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• question_answer27)
  The temperature of sun is 5500 K and it emits maximum intensity radiation in the yellow region \[(5.5\times {{10}^{-7}}m)\]. The maximum radiation from a furnace occurs at wavelength \[11\times {{10}^{-7}}m.\]The temperature of furnace is                                           [J & K CET 2000]
  A)
             1125 K                                      done clear
  B)
             2750 K done clear
  C)
             5500 K                                      done clear
  D)
             11000 K done clear
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• question_answer28)
  A particular star (assuming it as a black body) has a surface temperature of about \[5\times {{10}^{4}}K.\]The wavelength in nanometers at which its radiation becomes maximum is (b = 0.0029 mK)                                               [EAMCET (Med.) 2003]
  A)
             48   done clear
  B)
             58 done clear
  C)
             60   done clear
  D)
             70 done clear
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• question_answer29)
  The maximum energy in thermal radiation from a source occurs at the wavelength 4000Å. The effective temperature of the source is                                                    [AMU (Engg.) 1999]
  A)
             \[7325\,K\]                            done clear
  B)
             \[80000K\] done clear
  C)
             \[{{10}^{4}}\,K\]                  done clear
  D)
             \[{{10}^{6}}\,K\] done clear
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• question_answer30)
  The intensity of radiation emitted by the sun has its maximum value at a wavelength of \[510\ nm\] and that emitted by the north star has the maximum value at \[350\ nm\]. If these stars behave like black bodies, then the ratio of the surface temperature of the sun and north star is [IIT 1997 Cancelled; JIPMER 2000; AIIMS 2000]
  A)
             1.46                                           done clear
  B)
             0.69 done clear
  C)
             1.21                                           done clear
  D)
             0.83 done clear
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