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I am really stuck on setting up the problem & equations to solve, can someone please help me out with this beginning step?

The question is:

Will both plasmas annihilate completely or only half of each plasma will annihilate? I know that when protons and antiprotons collide, they annihilate completely. But in this case, say, the protons surely can collide with the positrons instead of colliding with the anti-protons, right?

I think I need the "mass" to do the calculations. How can I figure out the total mass the the two plasmas? I don't know how many protons, positrons, etc., there are...

And I don't even know the speed of the protons, positrons, etc., how can I calculate the energy without the speed of the particles?

How many photons will be released? One? Two? Three? How can I know?

Any help of any kind is greatly appreciated! Thank you!:)

The question is:

**1) A plasma out in space containing protons and electrons meets up with another plasma containing anti-protons and positrons. At what rest wavelengths would you expect to observe the spectral signatures of this collision?**Will both plasmas annihilate completely or only half of each plasma will annihilate? I know that when protons and antiprotons collide, they annihilate completely. But in this case, say, the protons surely can collide with the positrons instead of colliding with the anti-protons, right?

I think I need the "mass" to do the calculations. How can I figure out the total mass the the two plasmas? I don't know how many protons, positrons, etc., there are...

And I don't even know the speed of the protons, positrons, etc., how can I calculate the energy without the speed of the particles?

How many photons will be released? One? Two? Three? How can I know?

Any help of any kind is greatly appreciated! Thank you!:)

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