According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________________?

Related Mcqs:

1. The value of the wavelength for maximum emissive power is given by ___________________?

   A. Wien’s law
   B. Planck’s law
   C. Stefan’s law
   D. Fourier’s law
   E. Kirchhoff’s law

2. According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to___________________?

   A. absolute temperature
   B. square of temperature
   C. fourth power of absolute temperature
   D. fourth power of temperature
   E. cube of absolute temperature

3. The ratio of the energy absorbed by the body to total energy falling on it is called_________________?

   A. absorptive power
   B. emissive power
   C. absorptivity
   D. emissivity
   E. none of the above

4. The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?

   A. emissivity
   B. transmissivity
   C. reflectivity
   D. intensity of radiation
   E. absorptivity

5. According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?

   A. grey body
   B. brilliant white polished body
   C. red hot body
   D. black body
   E. none of the above

6. According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to____________________?

   A. absolute temperature
   B. T2
   C. T5
   D. t
   E. l/T

7. The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?

   A. shorter wavelength
   B. longer wavelength
   C. remains same at all wavelengths
   D. wavelength has nothing to do with it
   E. none of the above

8. 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?

   A. 0.45
   B. 0.55
   C. 0.40
   D. 0.75
   E. 0.60

9. Fourier’s law of heat conduction is valid for_________________?

   A. one dimensional cases only
   B. two dimensional cases only
   C. three dimensional cases only
   D. regular surfaces having non-uniform temperature gradients
   E. irregular surfaces

10. Planck’s law holds good for________________?

    A. black bodies
    B. polished bodies
    C. all coloured bodies
    D. all of the above
    E. none of the above