A body which transmits all the radiations falling on it is known as

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• A black body absorbs all radiations. As a result of absorption of these radiations
• All radiations in a black body are
• In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2 . Neglecting the heat capacity of agitator, the temperature of water (in °C) is
• The ratio of the energy absorbed by the body to total energy falling on it is called
• Which of the following is generally considered as opaque surface towards radiations?
• Electromagnetic radiations propagate in vacuum with a velocity of __________ metre/second.
• When a body is in thermal equilibrium with its surroundings, the absorptivity and the emissivity of the body are same. This Law is known as
• If the absorptivity plus reflectivity of a body equals 1, then the body is known as
• The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body).
• The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as