BANSAL-HEAT TRANSFER-Exercise
- Three metal rod A, B and C of same length and cross-section are placed...
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- Two identical rectangular rods of metal are welded end to end in serie...
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- A composite cylinder is made of two materials having thermal conductiv...
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- A metal sphere with a black surface and radius 30 min, is cooled to -7...
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- A pan filled with hot food cools from 94^(@)C to 86^(@)C in 2 minutes ...
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- A body cools from 50^(@)C to 40^(@)C in 5 minutes. The surrounding tem...
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- One end of a 2.35m long and 2.0cm radius aluminium rod (K=235W.m^(-1)K...
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- The rate of emission of radiation of a black body at 273^(@)C is E, th...
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- Stars S(1) emits maximum radiation of wave length 420nm and the star S...
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- A black body calorimeter filled with hot water cools from 60^(@)C to 5...
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- From Kirchoff's law the ratio of emissive power and absorption power o...
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- If at temperature T, the emissive power and absorption power of a body...
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- During total solar eclipse Fraunhoffer's lines appear bright because -
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- A polished metal plate with a rough black spot on it is heated to abou...
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- The temperature of a body is increased by 50%. The amount of radiation...
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- Radius of a shere is R density is d and specific heat is s, Is is heat...
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- If a body at 27^(@)C emits 0.3 watt of heat then at 627^(@)C, it will ...
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- If the rate of emission of radiation by a body at temperature TK is E ...
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- A liquid takes 10 minutes to cool from 80^(@)C to 50^(@)C. The tempera...
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- A metallic sphere cools from 50^(@)C to 40^(@)C in 300 seconds. If the...
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