Thermal Properties of Matter questions
823 published questions with worked solutions.
- A star acting is a black body has radius 'R'. What would be the temperature of star if the rate of production of energy is 'Q'? (...
- Two spherical black bodies have radii 'R_1' and 'R_2'. Their surface temperature are T_1 K and T_2 K respectively. If they...
- Kirchhoff's law of radiation proves that [MHT-CET 2021]
- The energy spectrum of a black body exhibits a maximum around a wavelength ' '. The temperature of a black body is now changed...
- Given that 'p' joule of heat is incident on a body and out of it 'q' joule is the total amount of heat reflected and transmitted...
- The ratio of rate of loss of heat from a metal sphere at 627^ C with rate of loss of heat from the same sphere at 227^ C will be...
- If the temperature of the sun is doubled, the rate of energy received by the earth will be increased by a factor [MHT-CET 2021]
- The emissive power of sphere of area 0.04 m^2 is 0.7 k cal s^ -1 m^ -2 . The amount of heat radiated in 20 second is [MHT-CET...
- For a perfectly black body, coefficient of emission is [MHT-CET 2021]
- The temperature of a black body is increased by 50%, then the percentage increase in the rate of radiation by the body is...
- Assume that for solar radiation, surface temperature of the sun is 6000 K. If Wien's constant 'b' is 2.897 10^ -3 mK, the value...
- Two spheres 'S_1' and 'S_2' have same radii but temperatures are 'T_1' and 'T_2' respectively. Their emissive power is same and...
- The radiation energy density per unit wavelength at temperature T is maximum at a wavelength _0. At temperature 2T, it will have...
- A black sphere has radius 'R' whose rate of radiation is 'E' at temperature 'T'. If radius is made ' R 3 ' and temperature '3T',...
- Two solid spheres, of radii R_1 and R_2 made of same material and have similar surfaces. The spheres are raised to the same...
- An object is cooled from 75°C to 65°C in 2 min. The time, it takes to cool from 55°C to 45°C is [The temperature of surrounding...
- Three black discs x, y, z have radii 1 m, 2 m and 3 m respectively. The wavelength corresponding to maximum intensity are 200 nm,...
- At 273°C, the emissive power of a perfect black body is 'R'. Its emissive power at 0°C is [MHT-CET 2020]
- A star (P) behaves like a perfectly black body emitting radiant energy at temperature 'T'. Another star (Q) also behave like...
- In a black body radiation, which one of the following is the WRONG statement? [MHT-CET 2020]
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