C. What is the average energy released per fission event in this chain reaction?

In summary, the fission reaction n + 235U → 236U* → 141Ba + 92Kr + 3n produces 170 MeV of kinetic energy. To produce 1 kilowatt-hour (kWh) of energy, multiple fission events are needed. As for part B, the net change in the number of free neutrons is not always 3, as some neutrons may be absorbed or escape. The exact number of neutrons produced can vary depending on the specific reaction and conditions.
  • #1
pooka
41
0
The fission reaction n + 235U → 236U* → 141Ba + 92Kr + 3n produced 170 MeV of kinetic
energy.

A. How many of these fission events are needed to produce energy of 1 kilowatt- hour (kWh), that is, the energy it takes to run your blow dryer for an hour?

B. How many neutrons are produced in this chain reaction process?

I know how to do A. I was just wondering how to do part B. Is it just: 3^(# of reactions needed)?
 
Physics news on Phys.org
  • #2
Why do you want to exponentiate that?
And are you sure that in the end, you have 3 neutrons left for each reaction?
 
  • #3
For part B, you need to give the net change in the number of free neutrons.
 
  • #4
If you don't see why it shouldn't be 3, take a look at dynamicsolo's signature :smile:
 
  • #5
Thanks guys!
 

What is a fission chain reaction?

A fission chain reaction is a nuclear reaction in which the nucleus of an atom splits into smaller parts, releasing a significant amount of energy. This energy can then trigger other atoms to split, creating a chain reaction.

What is the difference between a controlled and uncontrolled fission chain reaction?

A controlled fission chain reaction is one that is carefully managed and regulated, typically used in nuclear power plants to generate electricity. An uncontrolled fission chain reaction, on the other hand, is rapid and unregulated, resulting in a nuclear explosion.

What is the role of neutrons in a fission chain reaction?

Neutrons play a crucial role in a fission chain reaction. When an atom splits, it releases neutrons, which can then collide with other atoms, causing them to split and release more neutrons. This process continues, creating a chain reaction that releases a large amount of energy.

What are the potential dangers of a fission chain reaction?

One of the main dangers of a fission chain reaction is the release of radiation, which can be harmful to living organisms. Uncontrolled chain reactions can also lead to nuclear explosions, causing destruction and loss of life. Careful management and regulation are essential to prevent these dangers.

Can a fission chain reaction be stopped once it has started?

Yes, a fission chain reaction can be stopped through various methods, such as control rods, which absorb neutrons and slow down the chain reaction. Additionally, cooling systems can also help stop the reaction by removing excess heat. However, it is crucial to carefully monitor and control the reaction to prevent any potential dangers.

Similar threads

A Nuclear Reaction: Determining the velocity of neutrons
    • Introductory Physics Homework Help
Replies
3
Views
1K
Electrons and their little role in nuclear physics
    • Introductory Physics Homework Help
Replies
1
Views
748
Energy of neutron in fission reaction
    • Introductory Physics Homework Help
Replies
15
Views
2K
Reactor fuel and waste: fission/fusion problem
    • Introductory Physics Homework Help
Replies
2
Views
2K
I Questions about the energy released by nuclear fission
    • High Energy, Nuclear, Particle Physics
Replies
4
Views
1K
Calculating Energy Released from Uranium Fission
    • Introductory Physics Homework Help
Replies
3
Views
2K
I What kind of energy is released in a nuclear fusion reaction?
    • High Energy, Nuclear, Particle Physics
Replies
14
Views
1K
Principle of Nuclear Fission Direct Energy Conversion
    • Nuclear Engineering
Replies
5
Views
2K
Fission Reaction: How Many Neutrons Needed for Chain Reaction?
    • Other Physics Topics
Replies
3
Views
1K
What Is the Q-Value of Pu-239 Fission into Sr-92, He-4, and Neutrons?
    • Introductory Physics Homework Help
Replies
27
Views
5K

Hot Threads

Recent Insights

Back
Top