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The diagram shows four slabs of differen...

The diagram shows four slabs of different materials with equal thickness, placed side by side. Heat flows from left to right and the steady-state temperatures of the interfaces are given. Rank the materials according to their thermal conductivities, smallest to largest.

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In steady state heat transferred through each slab is same.
Than `(DeltaQ)/(Deltat)=(k_(1)ADeltaT_(1))/(d)=(k_(2)ADeltaT_(2))/(d)=(k_(3)ADeltaT_(3))/(d)=(k_(4)ADeltaT_(4))/(d)`
`k prop (1)/(DeltaT)` thus `3`, `4`, `2`, `1`
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BANSAL-HEAT TRANSFER-Exercise
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  2. Three metal rod A, B and C of same length and cross-section are placed...

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  3. Two identical rectangular rods of metal are welded end to end in serie...

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  4. A composite cylinder is made of two materials having thermal conductiv...

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  5. A metal sphere with a black surface and radius 30 min, is cooled to -7...

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  6. A pan filled with hot food cools from 94^(@)C to 86^(@)C in 2 minutes ...

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  7. A body cools from 50^(@)C to 40^(@)C in 5 minutes. The surrounding tem...

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  8. One end of a 2.35m long and 2.0cm radius aluminium rod (K=235W.m^(-1)K...

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  9. The rate of emission of radiation of a black body at 273^(@)C is E, th...

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  10. Stars S(1) emits maximum radiation of wave length 420nm and the star S...

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  11. A black body calorimeter filled with hot water cools from 60^(@)C to 5...

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  12. From Kirchoff's law the ratio of emissive power and absorption power o...

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  13. If at temperature T, the emissive power and absorption power of a body...

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  14. During total solar eclipse Fraunhoffer's lines appear bright because -

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  15. A polished metal plate with a rough black spot on it is heated to abou...

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  16. The temperature of a body is increased by 50%. The amount of radiation...

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  17. Radius of a shere is R density is d and specific heat is s, Is is heat...

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  18. If a body at 27^(@)C emits 0.3 watt of heat then at 627^(@)C, it will ...

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  19. If the rate of emission of radiation by a body at temperature TK is E ...

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  20. A liquid takes 10 minutes to cool from 80^(@)C to 50^(@)C. The tempera...

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  21. A metallic sphere cools from 50^(@)C to 40^(@)C in 300 seconds. If the...

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