Heat Transfer
Which one gives the monochromatic emissive power for black body radiation ?

Planck's law
Kirchhoffs law
Wien's law
Stefan-Boltzman law

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Heat Transfer
Nusselt number is the ratio of the

Heat flux at the wall to that across the entire pipe
None of these
Temperature gradient of the wall to that across the entire pipe
Temperature difference to the temperature gradient at the wall

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