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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
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JEE Main
IMPORTANT
The layers of atmosphere are heated through
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JEE Main
IMPORTANT
In which of the following process, convection does not take place primarily?
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JEE Main
IMPORTANT
Distribution of energy in the spectrum of a black body can be correctly represented by
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JEE Main
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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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JEE Main
IMPORTANT
The maximum wavelength of radiations emitted at is . What will be the maximum wavelength of radiations emitted at
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IMPORTANT
The maximum energy in thermal radiation from a source occurs at wavelength .
The effective temperature of the source is approximately (Wien's displacement constant,
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JEE Main
IMPORTANT
The intensity of radiation emitted by the sun has its maximum value at a wavelength of and that emitted by the North star has the maximum value at . If these stars behave like black bodies, then the ratio of the surface temperature of the sun and North star is
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JEE Main
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The area of the hole of the heat furnace is . It radiates of heat per hour. If the emissivity of the furnace is , then its temperature is
