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qUESTIONS

From Kirchhoff’s law of thermal radiation, which one of the following is constant

A black body at a high temperature radiates energy at the rate of U (in Wm-²). When the temperature falls to half, the radiated energy (in Wm-²) will be

The surface area of a black body is 5×10^-4 m^2 and its temperature is 727°C. the energy radiated by it per minute is (σ=5.67×10^-8 Jm^-2 S^-1 K^-4)

The temperature of a black body is increased by 50%, then the percentage increase in the radiant energy is nearly

A monoatomic gas (Ɣ=5/3) initially at 27°C having volume ‘V is suddenly compressed to one-eighth of its original volume (v/8) After the compression temperature becomes

Equal volumes of two gases, having their densities in the ratio of 1: 16 exert equal pressures on the walls of two containers. The ratio of their r.m.s. speeds (C1/C2) is (C₁, C₂ are the r.m.s. speeds of two gases respectively):

A rectangular black body of temperature 127°C has surface area 6 cm x 3 cm and rate of radiation ‘E’. If its temperature is increased by 400°C and surface area is reduced to half the initial value then rate of radiation is

Two spherical black bodies have radii R1 and R₂. Their surface temperatures are T1K and T₂K respectively. If they radiate same power, the ratio R1/R2 is

The temperature at which a black body of unit area loses its energy at the rate of 1 joule/second is

Two identical metal balls at temperature 200°C and 400°C kept in air at 27°C. The ratio of net heat loss by these bodies is

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