The sufficient temperature for gaining 400kev of kinetic energy for hydrogen nuclei is 3*10^9 kelvin. but thermonuclear fusion is the source of nergy output in the interior of star. the interior of the sun have the temperature about 1.5*10^7 kelvin which is very low temperature for gaining 400kev of kinetic energy, but the reaction is still happening in this temperature.( but we know that for thermonuclear fusion we need 3*10^9 kelvin of temperature) so how it is possible????
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The primary source of solar energy, and that of similar size stars, is the fusion of hydrogen to form helium (the proton-proton chain reaction), which occurs at a solar-core temperature of 14 million kelvin.
The larger BE/A is, the less mass per nucleon, and so mass is converted to energy and released in these fusion reactions. ... So it is with fusion. If the nuclei are given enough kinetic energy to overcome the electric potential energy due to repulsion, then they can combine, release energy, and fall into a deep well.
Fusion, on the other hand, is very difficult. Instead of shooting a neutron at an atom to start the process, you have to get two positively charged nuclei close enough together to get them to fuse
High temperature - The high temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion between the protons.
Fusion requires temperatures about 100 million Kelvin (approximately six times hotter than the sun's core).
At these temperatures, hydrogen is a plasma, not a gas. Plasma is a high-energy state of matter in which all the electrons are stripped from atoms and move freely about.
The sun achieves these temperatures by its large mass and the force of gravity compressing this mass in the core. We must use energy from microwaves, lasers and ion particles to achieve these temperatures.
High pressure - Pressure squeezes the hydrogen atoms together. They must be within 1x10-15 meters of each other to fuse.
The sun uses its mass and the force of gravity to squeeze hydrogen atoms together in its core.
We must squeeze hydrogen atoms together by using intense magnetic fields, powerful lasers or ion beams.
With current technology, we can only achieve the temperatures and pressures necessary to make deuterium-tritium fusion possible. Deuterium-deuterium fusion requires higher temperatures that may be possible in the future. Ultimately, deuterium-deuterium fusion will be better because it is easier to extract deuterium from seawater than to make tritium from lithium. Also, deuterium is not radioactive, and deuterium-deuterium reactions will yield more energy.
Hope this information will help you:)
The larger BE/A is, the less mass per nucleon, and so mass is converted to energy and released in these fusion reactions. ... So it is with fusion. If the nuclei are given enough kinetic energy to overcome the electric potential energy due to repulsion, then they can combine, release energy, and fall into a deep well.
Fusion, on the other hand, is very difficult. Instead of shooting a neutron at an atom to start the process, you have to get two positively charged nuclei close enough together to get them to fuse
High temperature - The high temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion between the protons.
Fusion requires temperatures about 100 million Kelvin (approximately six times hotter than the sun's core).
At these temperatures, hydrogen is a plasma, not a gas. Plasma is a high-energy state of matter in which all the electrons are stripped from atoms and move freely about.
The sun achieves these temperatures by its large mass and the force of gravity compressing this mass in the core. We must use energy from microwaves, lasers and ion particles to achieve these temperatures.
High pressure - Pressure squeezes the hydrogen atoms together. They must be within 1x10-15 meters of each other to fuse.
The sun uses its mass and the force of gravity to squeeze hydrogen atoms together in its core.
We must squeeze hydrogen atoms together by using intense magnetic fields, powerful lasers or ion beams.
With current technology, we can only achieve the temperatures and pressures necessary to make deuterium-tritium fusion possible. Deuterium-deuterium fusion requires higher temperatures that may be possible in the future. Ultimately, deuterium-deuterium fusion will be better because it is easier to extract deuterium from seawater than to make tritium from lithium. Also, deuterium is not radioactive, and deuterium-deuterium reactions will yield more energy.
Hope this information will help you:)
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