Thermal Properties of Matter questions
823 published questions with worked solutions.
- The coefficient of absorption of perfectly black body is
- Lamp black absorbs radiant heat which is near about
- A star radiates maximum energy of wavelength _m at temperature T. What will be the temperature of another star which radiates...
- The S.I. units of the constant in Wein's displacement law are
- On investigation of light from three different stars A, B and C, it was found that in the spectrum of A, the intensity of red...
- The spectrum of black body radiation is a
- A shining 500 W bulb behaves like a black body because
- The area under the curve drawn between E_ and for a body is proportional to
- The radiation energy density per unit wavelength at a temperature T has a maximum at a wavelength _0. At temperature 2T, it will...
- If the emissive and absorptive powers of a body are E and A respectively at temperature T, then the emissive power of a black...
- Three bodies A, B and C have equal area which are painted red, yellow and black respectively. If they are at same temperature,...
- The rate of emission of electromagnetic energy by any body does not depend on
- Coefficient of emission of a surface does NOT depend on
- Emissivity of perfectly black body is
- For a perfectly black body, its absorptive power is
- The ratio of emissive power in all the bodies at a given wavelength and a fixed temperature to that of a perfect black body at...
- The emissive power of a body does not depend upon _______ of the body
- Coefficient of emission or emissivity (e) is defined as
- At temperature T, the emissive power and absorption power of a body for certain wavelength are e_ and a_ respectively, then
- If a sphere, cube and thin plate are heated and then kept in the same surrounding, the one which cools first is
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