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The amount of radiations emitted per second by unit area of a hollow container at will be ....... , SI units
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Important Questions on Thermal Properties of Matter
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If the temperature of a lamp is about , then the wavelength at which maximum emission takes place will be (Wien's constant )

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The rate of cooling of a sphere of thermal capacity is . Rate of fall of it's temperature is:

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A solid black sphere of radius and a solid black cylinder of the same material, same radius and with height equal to the radius of the sphere, are at the same temperature. These are allowed to cool in the same surroundings. The ratio of the rate of fall of their temperature will be,

MEDIUM
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Two identical calorimeters of negligible heat capacities are filled with two liquids and whose densities are in the ratio . The ratio of times taken in cooling from to is . The ratio of their specific heats is

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A blackened metal foil receives heat from a heated sphere placed at a distance from it. It is found that the foil receives power . If the temperature and the distance of the sphere are doubled, then, the power received by the foil will be,

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The temperature of a room is . A body kept in it, takes for cooling from to . The time taken by the body in cooling from to will be:

HARD
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A calorimeter of water equivalent having of water takes minutes to cool from to . When it is filled with of tarpin oil, it takes minutes to cool from to . Specific heat of tarpin oil will be?
