Consider the following statements:
In a nuclear reactor, self-sustained chain reaction is possible, because:
1. more neutrons are released in each of the fission reactions.
2. the neutrons immediately take part in the fission process.
3. the fast neutrons are slowed down by graphite.
4. every neutron released in the fission reaction initiates further fission.
Which of the statements given above are correct?
Consider the following statements:
In a nuclear reactor, self-sustained chain reaction is possible, because:
1. more neutrons are released in each of the fission reactions.
2. the neutrons immediately take part in the fission process.
3. the fast neutrons are slowed down by graphite.
4. every neutron released in the fission reaction initiates further fission.
Which of the statements given above are correct?
The correct option is A 1,2 and 3
In a nuclear reactor, self-sustained chain reaction is possible,
because:
1. more neutrons are released in each of the fission reactions.
2. the neutrons immediately take part in the fission process.
3. the fast neutrons are slowed down by graphite.
A nuclear reactor is designed to allow a controlled chain reaction to
take place. Moveable control rods are placed between the rods of nuclear fuel.
These control rods absorb some of the neutrons, so fewer neutrons are available
to split uranium nuclei.
1. more neutrons are released in each of the fission reactions : A
possible nuclear fission chain reaction. ... A uranium-235 atom absorbs a
neutron, and fissions into two new atoms (fission fragments), releasing three
new neutrons and a large amount of binding energy.
2. the neutrons immediately take part in the fission process : In nuclear
fission, an unstable atom splits into two or more smaller pieces that are more
stable, and releases energy in the process. The fission process also releases
extra neutrons, which can then split additional atoms, resulting in a chain
reaction that releases a lot of energy.
3.the fast neutrons are slowed down by graphite : First,
a moderator cannot absorb neutrons itself. This means that the moderator should
have a low neutron absorption cross-section. However, the moderator should be
able to slow down neutrons to an acceptable speed. Clearly, an obvious way to
make a reactor work, and to make use of this characteristic of the 235U(n,f)
cross-section, is to slow down the fast, fission neutrons. This can be
accomplished, for example, when the neutrons collide with nuclei and scatter in
some substance (a moderator).
In a nuclear reactor, self-sustained chain reaction is possible, because:
1. more neutrons are released in each of the fission reactions.
2. the neutrons immediately take part in the fission process.
3. the fast neutrons are slowed down by graphite.
A nuclear reactor is designed to allow a controlled chain reaction to take place. Moveable control rods are placed between the rods of nuclear fuel. These control rods absorb some of the neutrons, so fewer neutrons are available to split uranium nuclei.
1. more neutrons are released in each of the fission reactions : A possible nuclear fission chain reaction. ... A uranium-235 atom absorbs a neutron, and fissions into two new atoms (fission fragments), releasing three new neutrons and a large amount of binding energy.
2. the neutrons immediately take part in the fission process : In nuclear fission, an unstable atom splits into two or more smaller pieces that are more stable, and releases energy in the process. The fission process also releases extra neutrons, which can then split additional atoms, resulting in a chain reaction that releases a lot of energy.
3.the fast neutrons are slowed down by graphite : First, a moderator cannot absorb neutrons itself. This means that the moderator should have a low neutron absorption cross-section. However, the moderator should be able to slow down neutrons to an acceptable speed. Clearly, an obvious way to make a reactor work, and to make use of this characteristic of the 235U(n,f) cross-section, is to slow down the fast, fission neutrons. This can be accomplished, for example, when the neutrons collide with nuclei and scatter in some substance (a moderator).
