Radiation Energy The total radiation energy E emittedby a heated surface per unit area varies as the fourthpower of its absolute temperature T. The temperature is6000 K at the surface of the sun and 300 K at the surfaceof the earth.(a) How many times more radiation energy per unit area isproduced by the sun than by the earth?(b) The radius of the earth is 3960 mi, and the radius of thesun is 435,000 mi. How many times more total radiationdoes the sun emit than the earth?
Latent heat and phase change
A physical process in which a conversion among the basic states or phases of matter, i.e., solid, liquid, and gas takes place under the effect of a certain temperature and pressure is referred to as a phase change. Generally, the phase change of a substance occurs when heat transfer takes place between the substance and its surroundings. Based on the direction in which heat transfer takes place, different types of phase changes can occur.
Triple Point of Water
The branch of physics in which observer deals with temperature related properties is called thermodynamics.
Boiling Point of Water
Everyday examples of boiling is, boiling milk, heating water. One would have observed that when we heat water it goes through various stages and at one point bubbles show in water, and water keeps splashing with bubbles bursting, we in layman terms say that water is boiling.
Freezing Point of Water
In general, the freezing point of water is 0° Celsius, or 32° Fahrenheit. This is the temperature at which water will ordinarily change from its liquid state to its solid state (ice). However, there are certain conditions that can affect the freezing point of water. For example, a liquid may be supercooled or contain impurities so that it does not freeze at the ordinary freezing point.
by a heated surface per unit area varies as the fourth
power of its absolute temperature T. The temperature is
6000 K at the surface of the sun and 300 K at the surface
of the earth.
(a) How many times more radiation energy per unit area is
produced by the sun than by the earth?
(b) The radius of the earth is 3960 mi, and the radius of the
sun is 435,000 mi. How many times more total radiation
does the sun emit than the earth?
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