Which of the following is most repaid process
Conduction
Convection
Radiation
None of these
Additional Questions
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Two spheres made of same material have radii in the ratio 2:1. if both the spheres are at same temperature, then what is the ratio of heat radiation energy emitted per second by them? |
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A perfectly black body emits radiation at temperature $T_{1}$ K. If it is to radiate 16 times this power, its temperature $T_{2}$. will be |
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Unit of Stefan’s constant is given by |
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The flow of heat from a hot body to a cold body is an example of |
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For which of the following process, the thermal conduction is maximum? |
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Three black bodies A, B and C in the form of cubes of sides in the ratio of 3: 4: 5 are kept at the same high temperature. The ratio of the quantity of heat lost per second by A, B and C will be |
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A sphere, a cube and a thin circular plate all made of the same material and having the same mass are initially heated to a temperature of 300°C. which one of these cools faster? |
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A body cools from 60°C to 50°C in 10 minutes. If the room temperature is 25°C and assuming Newton’s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be |
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The emissive of a perfectly black body is |
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The coefficient of transmission of a perfectly black body is |
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