Stefan’s block body radiation law can also be derived from ______________ law?

Related Mcqs:

1. The statement that “maximum wavelength of radiation is inversely proportional to the temperature” is ______________ law?

   A. Stefan-Boltzmann’s
   B. Planck’s
   C. Wien’s displacement
   D. None of these

2. Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K) ?

   A. t4
   B. T4
   C. 1/t4
   D. 1/T4

3. Kirchoff‟s law applies to _____________ radiation?

   A. Total
   B. Monochromatic
   C. Both A. & B.
   D. Neither A. nor B.

4. A black body does not ____________ radiation?

   A. Absorb or emit
   B. Refract
   C. Reflect
   D. Both B. & C.

5. The absorptivity of a grey body at a given temperature _____________ with increasing wavelength of radiation?

   A. Increases
   B. Decreases
   C. Remain constant
   D. May increase or decrease; depends on the material

6. A perfect black body is a perfect _____________ of radiation?

   A. Absorber
   B. Emitter
   C. Both A. & B.
   D. Neither A. nor B.

7. Which one gives the monochromatic emissive power for black body radiation ?

   A. Planck’s law
   B. Kirchhoff’s law
   C. Wien’s law
   D. Stefan-Boltzmann law

8. The rate of emission of radiation by a body does not depend upon the__________________?

   A. Wavelength of radiation
   B. Surface temperature of the body
   C. Nature of the surface
   D. Shape and porosity of the body

9. The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of ‘n’ is exactly 4 for__________________?

   A. Black painted bodies only
   B. All bodies
   C. Polished bodies only
   D. A black body

10. A black body when hot, emits heat radiation of _____________ wavelengths?

    A. Small
    B. Large
    C. All
    D. One fixed