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What is the critical temperature at which nuclear reactions begin?
For nuclear fission reactors there is no critical temperature, though they do have a temperature coefficient which makes the efficiency of the chain reaction vary slightly with temperature. This can be negative or positive, obvously a negative coefficient is preferred and is safer. Nuclear fusion is another matter, and very high temperatures are required in tokamaks to get fusion started
What is the process by which a protostar is heated up to initiate nuclear fusion and become a star?
A protostar is heated up by gravitational forces causing it to contract and increase in temperature. Once the core reaches a high enough temperature and pressure, nuclear fusion reactions begin, releasing energy and making the protostar shine as a star.
What is happening to a substance undergoing heat of fusion?
During the heat of fusion, a substance is transitioning from a solid phase to a liquid phase. The heat energy is being absorbed by the substance, causing the particles to break free from their fixed positions and begin to move more freely. This results in a change in the physical state of the substance without a change in temperature.
At what temperature does steel begin to glow?
Steel begins to glow red at a temperature of around 900 degrees Celsius.
At what temperature does a block of ice at 0C begin to change its temperature as it melts?
A block of ice at 0C begins to change its temperature as it melts when it reaches 0C.
What temperature does star fusion begin to occur?
The minimum temperature is about 10,000,000 degrees Celsius.
When does helium fusion begin in a star?
Hydrogen undergoes nuclear fusion to form helium at a temperature of 107 K
Inside a prostar the nuclear fusion of hydrogen will begin when?
The core of the protostar reached an extremely high temperature
What is the critical temperature at which nuclear reactions begin?
For nuclear fission reactors there is no critical temperature, though they do have a temperature coefficient which makes the efficiency of the chain reaction vary slightly with temperature. This can be negative or positive, obvously a negative coefficient is preferred and is safer. Nuclear fusion is another matter, and very high temperatures are required in tokamaks to get fusion started
When a protostar rises to 10000000 degrees celsius will a protostar become a star before or after nuclear fusion?
A protostar must reach about 10 million degrees Celsius for nuclear fusion to start in its core, triggering the transition into a true star. This marks the point where hydrogen atoms begin fusing into helium, releasing energy in the process. So, a protostar will become a full-fledged star after nuclear fusion begins at this temperature.
At what temperature do star begin the process of nuclear fusion?
Stars begin the process of nuclear fusion when their cores reach temperatures of around 10 million degrees Celsius. At this temperature, hydrogen atoms in the core of the star are able to overcome the electrostatic repulsion between positively charged protons and fuse together to form helium.
How hot is the core of a protostar?
The core will reach between 250,000,000 to 500,000,000'C at its stable temperature. Beforehand it will rapidly gain heat from hundreds of thousands to its stable temperature, where it can begin the process of nuclear fusion. Hope that helps!
When will helium fusion begin?
5 min
What is the process by which a protostar is heated up to initiate nuclear fusion and become a star?
A protostar is heated up by gravitational forces causing it to contract and increase in temperature. Once the core reaches a high enough temperature and pressure, nuclear fusion reactions begin, releasing energy and making the protostar shine as a star.
Which operations require you to align numbers using their decimal points before you begin a calculation?
Addition and subtraction.
When a star forms where is the build up of temperature and pressure the greatest?
The build up of temperature and pressure is greatest at the core of the forming star. This is where gravity causes atoms to be squeezed together and nuclear fusion reactions begin, releasing huge amounts of energy.
When the pressure and temperature of a nebula increases what is formed?
When the pressure and temperature of a nebula increase, it can lead to the formation of protostars. As gravity causes the nebula to contract and heat up, eventually nuclear fusion can begin at the core of the protostar, leading to the formation of a new star.
