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MHT-CET Kinetic Theory of Gases and Radiation — practice questions — page 3

Explore 64 free Kinetic Theory of Gases and Radiation questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Kinetic Theory of Gases and Radiation questions and exercises with answers

Showing questions 61–64 of 64.

For a body that is not a perfect blackbody, the radiated power per unit area is given by which expression?Read the answer and worked solution →A blackbody of area 200 square cm at 127 degrees Celsius radiates for one minute. How much energy is emitted?Read the answer and worked solution →A 60 W lamp filament of emissivity 0.5 and area 5 x 10^-5 m^2 loses all its energy by radiation. What is its temperature?Read the answer and worked solution →Two blackbodies of equal area are at absolute temperatures in the ratio 1:3. What is the ratio of power they radiate?Read the answer and worked solution →

Worked practice questions

For a body that is not a perfect blackbody, the radiated power per unit area is given by which expression?

  1. sigma T^4
  2. e sigma T^4
  3. sigma T^4 / e
  4. e sigma T
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Correct answer: B. e sigma T^4

An ordinary body radiates less than a blackbody by its emissivity factor e, so R = e sigma T^4.

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A blackbody of area 200 square cm at 127 degrees Celsius radiates for one minute. How much energy is emitted?

  1. About 174 J
  2. About 1742 J
  3. About 17420 J
  4. About 100 J
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Correct answer: B. About 1742 J

Q = sigma A t T^4 = 5.67e-8 x 0.02 x 60 x 400^4, which is about 1742 J.

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A 60 W lamp filament of emissivity 0.5 and area 5 x 10^-5 m^2 loses all its energy by radiation. What is its temperature?

  1. About 1500 K
  2. About 2550 K
  3. About 3500 K
  4. About 5000 K
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Correct answer: B. About 2550 K

T^4 = 60 / (0.5 x 5.67e-8 x 5e-5) = 4.23e13, giving T of about 2550 K.

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More Physics topics

ElectrostaticsCurrent ElectricityOscillationsElectromagnetic InductionKinetic Theory of GasesMechanical Properties of FluidsAtomsWave Optics