EASY
JEE Main
IMPORTANT
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For proper ventilation of the building, windows must be open near the bottom and top of the walls to let pass 

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Important Questions on Calorimetry and Heat Transfer

EASY
JEE Main
IMPORTANT
In which of the following process, convection does not take place primarily?
EASY
JEE Main
IMPORTANT
Distribution of energy in the spectrum of a black body can be correctly represented by
EASY
JEE Main
IMPORTANT
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
EASY
JEE Main
IMPORTANT
The maximum wavelength of radiations emitted at 900 K is 4 μm. What will be the maximum wavelength of radiations emitted at 1200 K?
EASY
JEE Main
IMPORTANT
The maximum energy in thermal radiation from a source occurs at wavelength 4000 Ao.

The effective temperature of the source is approximately (Wien's displacement constant, b=2.89×10-3 m K

EASY
JEE Main
IMPORTANT
The intensity of radiation emitted by the sun has its maximum value at a wavelength of 510 nm and that emitted by the North star has the maximum value at 350 nm. If these stars behave like black bodies, then the ratio of the surface temperature of the sun and North star is
EASY
JEE Main
IMPORTANT
The area of the hole of the heat furnace is 10-4 m2. It radiates 1.58×105 cal of heat per hour. If the emissivity of the furnace is 0.80, then its temperature is