Assertion: We should wear light coloured clothes in summer. Reason: Amount of heat that a body can absorb depends only on temperature and independent of color, shape and size.

Question

Assertion-ReasonHeat Transfer by RadiationBlack Body Radiation

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Black body radiation curves are universal. They depend only on the temperature and not on the size, shape of the material of the black body. The energy emitted per unit time versus wavelength of a black body is given by the figure shown.

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A cup of hot coffee is left on table after some time coffee cools down. What is the mode of transfer of heat for this cooling?

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Identify the type of heat transfer in a vacuum flask.

TextHeat Transfer by Radiation