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Electromagnetic waves are energy waves produced by the oscillation or acceleration of an electric charge. They include radio waves, microwaves, infrared light, visible light, ultraviolet light, x-rays, and gamma rays. Their wavelengths in meters are: radio waves (0.1 to 1000), microwaves (1 x 10-3 ~ 1 x 10-1); infrared (7 x 10-7 ~1 x 10-3); visible light (4 x 10-7 ~ 7 x 10-7); ultraviolet rays (1 x 10-8 ~ 4 x 10-7); x-rays (1 x 10-11 ~ 1 x 10-8) and gamma rays (< 1 x 10-11).
Scientists have inferred that such great amounts of energy as produced by the Sun (4x1026 watts per second) can only be the result of nuclear fusion
If such energy were produced through the most efficient chemical reaction, the Sun would not last for more than a few thousand years. Evidence suggests that the lifespan of the Sun is in billions of years; hence the Sun's energy cannot be the result of chemical reaction.
Nuclear fusion occurs when two positively charged atomic nuclei are fused together. In the Sun hydrogen...
Fusion requires extremely high temperatures and densities to overcome the repulsion between positively charged nuclei. Such conditions are present in the core of the Sun (100 times the density of water on Earth, and temperatures of about 27 million degrees F).
5. The factors that make some stars appear brighter than others are their luminosity (how much energy they give out in a given time) and their distance from us. Obviously the stars nearer in distance appear brighter if their luminosity is the same. The luminosity of the stars, in turn, depends on their size, mass, and temperature; hence larger stars may appear brighter than smaller stars although they may be further away.
6. The Sun is an "average" star in terms of its mass, light production, and size. It appears so different from other stars because of its relative proximity to the Earth. All stars including the Sun are balls of hot, glowing gas that are hot and dense enough to…
Energy and Its Sources Energy is an important element in daily life since it used for many activities like moving vehicles, promoting growth of the human body, and enabling humans to think. However, energy can be found in various forms like sound, heat, motion, and light though they are classified into kinetic and potential energy. While kinetic energy is the motion of substances, waves, objects, molecules, and atoms; potential energy is
These massive walls of water travel faster than a commercial jet as they descend upon cities and islands. The energy and force of a Tsunamis is the massive transference of potential energy, caused by the shifting currents of the ocean, into kinetic energy that active pushes the Tsunamis forward. In 2004, one tsunami traveled 375 miles in a mere 75 minutes, about 300 miles per hour. Energy however is
Physics The heat engine or heat pump moves heat from one location to another. It usually takes heat out of the air or from the ground and transfers it to a building, such as a house or office. The word "heat" means thermal energy not temperature. Rather than warming the house or office with a furnace that burns fuel, the heat is transferred from the air or ground by using this
The second stage of the process will involve developing the stratospheric platforms that can be used in routing electric power from the power plants that will be established to the source areas scattered all over the world. The last stage will involve the full utilization of the space power technology where clean and efficient space power will effectively be used to light and power the world. While many of these
Non-Ionizating Radiation In recent years mobile telecommunication has developed to a large extent. It has been able to gain a place of importance in society. Encouraged on the basis of these developments the society on the whole is facing a humongous alteration. Now it is possible to access any individual in any part of the world where telecommunication has spread its roots. The latest technologies actually let us now to transfer
An object's heat capacity is the product of its precise heat capacity, which is the quantity of heat necessary to raise 1 kg of the material one degree, and it's mass in kg. Heat capacity is a widespread property of a matter. In other words its worth varies depending on how much matter is present (Jorgensen, 2011). What are the various sources of heat? The sun is an element of the