Related Questions

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
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
In a city 40% of the people have black hair, 25% have black eyes and 10% have both black hair and black eyes. What percentage of the people in the city has neither black hair nor black eyes?
A 35
B 40
C 45
D 50
In a certain city 40% of the people have black hair, 25% have black eyes and 10% have both black hair and black eyes. What percentage of the people in the city have neither black hair nor black eyes?
A 35
B 40
C 45
D 50
The emissive power of a body depends upon its
A Temperature
B Wave length
C Physical nature
D All of the above
A body is called grey if the monochromatic emissivity of the body is
A Zero
B Unity
C Same for all wavelengths
D Different for all wavelengths
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
A basket contains four balls of four diffirent colors -white red, black and green which will be distributed among for persons Rajib, Litu, Simu, and Rida. Rida must not be given the black one. Simu not be given either the black one or the green one. If the above conditions are fulfilled, Which of the following must be true?
A Simu will be given the red one
B Lity will given the black one
C Rida will be given the green one
D All of these

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