(a) Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in the infrared) to 3.5 m2of the Earth's surface at night. Assume the emissivity is 0.88, the temperature of the Earth is 15°C, and that of outer space is 2.7 K. (Include the sign of the heat transfer to 3.5 m2 of the Earth's surface in the value of your answer.) W (b) Compare the intensity of this radiation with that absorbed by the Earth from the Sun during the day. The intensity of the radiation from the Sun averages about 800 W/m2, only half of which is absorbed by the Earth. Iradiation at night Iabsorbed during day (c)What is the maximum magnetic field strength (in µT) in the outgoing radiation, assuming it is a continuous wave? µT
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
| Iradiation at night |
| Iabsorbed during day |
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