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Newton's law of cooling is used in laboratory for the determination of the

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Important Questions on Heat Transfer

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 40

The υm-T, curve for a perfect black body is (υm→frequency corresponding to maximum emission of radiation)

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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 41
The temperature of a furnace is 2324°C and the intensity is maximum when its radiation spectrum is nearly at 12000 Α∘. lf the intensity in the spectrum of a star is maximum nearly at 4800 A∘, then the surface temperature of star is
 
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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 42
There is a black spot on a body. If the body is heated and carried in dark room, then it glows more. This can be explained on the basis of
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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 44
If a carved black utensil is heated to high temperature and then brought in dark then :
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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 45
According to Newton's law of cooling, the rate of cooling of a body is proportional to:
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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 46
The original temperature of a black body is 727ºC. Calculate temperature at which total radiant energy from this black body becomes double:
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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 47
Calculate the energy radiated per minute, from the filament of an incandescent lamp at 2000 K, if the surface area is 5×10−5 m2 and its relative emittance is 0.85 (σ=5.7×10−8 MKS units).
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Beta Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise (Conceptual Questions)>Q 48
The ratio of the radius of curvatures of cylindrical emitters of the same type is 1:4, and their temperature is in the ratio 2:1. The ratio of the amount of heat emitted by them is: (For the cylinder, length = radius)