You are Here: Home >< Physics

# Stuck on a Nuclear Physics question watch

1. I've been stuck on this physics question for ages and I still can't figure out the answer.

The net effect of this process is to convert four protons into one Helium-4 nucleus and release a large amount of energy. The overall reaction is:

4H --> He + 2Beta Particles

together with the emission of 2 neutrinos and 2 gamma particles
b) What is (i) the total mass loss (ii) the total energy released in the overall reaction?

2. (Original post by Draconid)
I've been stuck on this physics question for ages and I still can't figure out the answer.

The net effect of this process is to convert four protons into one Helium-4 nucleus and release a large amount of energy. The overall reaction is:

4H --> He + 2Beta Particles

together with the emission of 2 neutrinos and 2 gamma particles
b) What is (i) the total mass loss (ii) the total energy released in the overall reaction?

A level?

have you got any data on the rest mass of a He-4 nucleus and a proton... either on the data sheet or from an earlier section of the question?
3. Use the mass deficit equation for the mass loss and for total energy released I think it's mass loss as energy
4. (Original post by triton62674)
Use the mass deficit equation for the mass loss and for total energy released I think it's mass loss as energy
Whats the mass defict equation, havent heard of it before.
5. (Original post by Draconid)
Whats the mass defict equation, havent heard of it before.
Bet you've heard of E=mc2
6. (Original post by Draconid)
Whats the mass defict equation, havent heard of it before.
http://www.chem.purdue.edu/gchelp/ho...ing_energy.htm
7. (Original post by Joinedup)
A level?

have you got any data on the rest mass of a He-4 nucleus and a proton... either on the data sheet or from an earlier section of the question?
we are told to use the data sheet for the masses of a proton and positron; the mass of a helium nucleus is 4.00151u.
8. (Original post by Draconid)
we are told to use the data sheet for the masses of a proton and positron; the mass of a helium nucleus is 4.00151u.
The nucleus of hydrogen is a proton, u have the mass of proton on formula sheet.

Do initial mass-final mass to work out the change in mass, leave in terms of the atomic mass unit up until this point, then convert to kg.

Plug into E=mc^2 and find the energy lost
9. (Original post by Draconid)
we are told to use the data sheet for the masses of a proton and positron; the mass of a helium nucleus is 4.00151u.
Anything funny happened to the masses of the products of the reaction compared to the 4 protons going in?
10. (Original post by Joinedup)
Anything funny happened to the masses of the products of the reaction compared to the 4 protons going in?
Not really.
11. (Original post by Shaanv)
The nucleus of hydrogen is a proton, u have the mass of proton on formula sheet.

Do initial mass-final mass to work out the change in mass, leave in terms of the atomic mass unit up until this point, then convert to kg.

Plug into E=mc^2 and find the energy lost
Ahhh okay, I understand now, thanks for the help

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 28, 2017
The home of Results and Clearing

### 948

people online now

### 1,567,000

students helped last year
Today on TSR

### University open days

1. Sheffield Hallam University
Tue, 21 Aug '18
2. Bournemouth University
Wed, 22 Aug '18
3. University of Buckingham