Related Questions

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
The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)
A α.T
B α.$$\frac{1}{{\text{T}}}$$
C α.T4
D Independent of T
Which one gives the monochromatic emissive power for black body radiation?
A Planck's law
B Kirchhoffs law
C Wien's law
D Stefan-Boltzman law
The value of the wave length for maximum emissive power is given by
A Kirchhoff’s law
B Stefan’s law
C Wine’s law
D Planck’s law
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
The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium. This is __________ law.
A Kirchoffs
B Planck's
C Wien's displacement
D Stefan-Boltzman
_____________ is the example of photo emissive cell
A LDR
B Photo diode
C Photo transistor
D Photo multiplier
The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
A $$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$
B $$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$
C $$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$
D $$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$
The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoffs law.
A Wavelength of radiation
B Nature of the body
C Temperature of the body
D None of these
Effect of a force on a body depends upon its
A Direction
B Magnitude
C Position
D All the above

Next steps