Plutonium-239 builds up in reactor fuel at a rate that depends on the probability of neutron capture by
(all reactor fuel contains more
than
). Reactors designed specifically to make plutonium are called
breeder reactors . They seem to be inherently more hazardous than conventional reactors, but it remains unknown whether their hazards can be made economically acceptable. The four reactors at Chernobyl, including the one that was destroyed, were built to breed plutonium and produce electricity. These reactors had a design that was significantly different from the pressurized water reactor illustrated above.
Plutonium-239 has advantages over
as a reactor fuel — it produces more neutrons per fission on average, and it is easier for a thermal neutron to cause it to fission. It is also chemically different from uranium, so it is inherently easier to separate from uranium ore. This means
has a particularly small critical mass, an advantage for nuclear weapons.
Phet explorations: nuclear fission
Start a chain reaction, or introduce non-radioactive isotopes to prevent one. Control energy production in a nuclear reactor!
Test prep for ap courses
Which of the following statements about nuclear fission is true?
No new elements can be produced in a fission reaction.
Energy released in fission reactions is generally less than that from fusion reactions.
In a fission reaction, two light nuclei are combined into a heavier one.
Fission reactions can be explained on the basis of the conservation of mass-energy.
When
235 U is bombarded with one neutron, the following fission reaction occurs:
.
Find the values for
x and y.
Assuming that the mass of
235 U is 235.04 u, the mass of
141 Ba is 140.91 u, the mass of
92 Kr is 91.93 u, and the mass of
n is 1.01 u, a student calculates the energy released in the fission reaction as 2.689 × 10
−8 , but forgets to write the unit. Find the correct unit and convert the answer to MeV.
Nuclear fission is a reaction in which a nucleus is split.
Fission releases energy when heavy nuclei are split into medium-mass nuclei.
Self-sustained fission is possible, because neutron-induced fission also produces neutrons that can induce other fissions,
, where
and
are the two daughter nuclei, or fission fragments, and
x is the number of neutrons produced.
A minimum mass, called the critical mass, should be present to achieve criticality.
More than a critical mass can produce supercriticality.
The production of new or different isotopes (especially
) by nuclear transformation is called breeding, and reactors designed for this purpose are called breeder reactors.
Questions & Answers
A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?