# Solving kinetic energy of reaction's products

• Ryan.L
In summary, the conversation is about a difficulty in solving Problem 5 and determining the correct answer of 2.5MeV. There is also a discussion about the mass defect of X and the creation of a positron. The user is reminded to properly format their question and show their work.

## Homework Statement

This is my first thread in this forum, please forgive me if I made any mistake on posting.

## Homework Equations

I am having difficulty on solving the Problem 5.

## The Attempt at a Solution

The answer I obtained is 1.5MeV, is it correct ?

#### Attachments

• IMG_4878.JPG
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i think its 2.5MeV
the mass defect of X is 2MeV since the K.E. released(energy of the products) must be equal to the mass defect.
in 2nd eqn, the mass defect is sum of Mass defect of X and the electron
therefore we add 0.5MeV to the X's 2.0MeV to get 2.5MeV

proton007007

Hello Ryan, welcome to PF :)
Just so you learn from your 'mistakes': "I am having difficulty on solving the Problem 5" does not count as a relevant equation. Neither does " The answer I obtained is 1.5MeV, is it correct ? " count as an attempt at solution. PF has this template for very good reasons (see guidelines). We're not here to stamp-approve homework, but to help people along. So we need to know where you are and you can show by properly formulating the problem (i.e. not linking to a rotated test page) and listing off variables & known/given data, line up the equations you think you need and show what you have done.

I also have a question for proton: in the sescond reaction you also don't have to create a positron. Doesn't that yield another .5 MeV ?