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MHT-CET Kinetic Theory of Gases and Radiation — practice questions — page 2

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 31–60 of 64.

Lamp black or platinum black absorbs about what percentage of incident radiant heat?Read the answer and worked solution →What is the construction of Ferry's blackbody?Read the answer and worked solution →Why does Ferry's blackbody have a conical projection?Read the answer and worked solution →Why is the outer surface of Ferry's blackbody silvered?Read the answer and worked solution →Which statement about absorbers and emitters of radiation is correct?Read the answer and worked solution →Why are the walls of a thermos flask silvered?Read the answer and worked solution →On what does the radiation from a heated cavity depend?Read the answer and worked solution →Who published the theory of exchange of heat in 1792?Read the answer and worked solution →When does a body stay at constant temperature in its surroundings?Read the answer and worked solution →At room temperature, thermal radiation lies in which wavelength region?Read the answer and worked solution →At about 800 degrees Celsius, a heated body appears to be what colour?Read the answer and worked solution →Which colour does a body at about 3000 degrees Celsius look, like a tungsten filament?Read the answer and worked solution →What is the SI unit of emissive power of a surface?Read the answer and worked solution →How is the emissivity of a surface defined?Read the answer and worked solution →Which surface has the maximum emissive power at a given temperature?Read the answer and worked solution →According to Kirchhoff's law of thermal radiation, for a body in thermal equilibrium, emissivity equals what?Read the answer and worked solution →A body has high emissive power. What does Kirchhoff's law say about its absorptive power?Read the answer and worked solution →Who measured blackbody energy versus wavelength using a cavity radiator?Read the answer and worked solution →What does the area under a blackbody spectrum curve stand for?Read the answer and worked solution →As the temperature of a blackbody rises, what happens to the wavelength of maximum intensity?Read the answer and worked solution →Which classical formula fits blackbody data at long wavelengths but diverges at short wavelengths?Read the answer and worked solution →Wien's expression for spectral distribution agreed with experiment only in which region?Read the answer and worked solution →Planck modelled cavity atoms as what?Read the answer and worked solution →What is the value of Planck's constant used in the blackbody discussion?Read the answer and worked solution →Which statement is Wien's displacement law?Read the answer and worked solution →A blackbody radiates with its peak at a wavelength of 2.897 micrometres. What is its temperature?Read the answer and worked solution →Sun's emission peaks near 4995 angstrom. Which spectral region?Read the answer and worked solution →Wien's displacement law is useful for estimating what about distant stars?Read the answer and worked solution →In Stefan's law, radiant power per unit area goes as what?Read the answer and worked solution →Who proposed the empirical T^4 radiation law in 1879?Read the answer and worked solution →

Worked practice questions

Lamp black or platinum black absorbs about what percentage of incident radiant heat?

  1. 27 percent
  2. 57 percent
  3. 77 percent
  4. 97 percent
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Correct answer: D. 97 percent

These substances absorb nearly 97 percent of incident heat and so resemble a perfect blackbody.

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What is the construction of Ferry's blackbody?

  1. A solid copper sphere painted white
  2. A hollow double walled sphere with a hole
  3. A flat polished silver metal plate
  4. A glass bulb filled with neon gas
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Correct answer: B. A hollow double walled sphere with a hole

Ferry's blackbody is a double walled hollow sphere with a tiny hole, lampblack inside and a silvered outer surface.

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Why does Ferry's blackbody have a conical projection?

  1. To store more heat inside
  2. To cool the sphere quickly
  3. To stop back reflection out
  4. To raise the transmission
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Correct answer: C. To stop back reflection out

The cone prevents normal incidence, so rays reflect to the sides and undergo multiple reflections until absorbed.

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More Physics topics

ElectrostaticsCurrent ElectricityOscillationsElectromagnetic InductionKinetic Theory of GasesMechanical Properties of FluidsAtomsWave Optics