How to Calculate the Initial energy of two protons colliding

  • Thread starter msPhysics
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  • #1
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Homework Statement



Tow protons of equal energy collide head on and the result is

p+p -----> p+p+ Pi0

If all particles produced at rest what must be the KE of the initial protons



Homework Equations



mass of Pi0 = 135MeV/c2

The Attempt at a Solution



Total energy of the system, E= mc2

Mass of proton = 1.6726 *10-27 Kg

Hence initial energy = 2* 1.6726*10-27*2.99*108*2.99*108

But in this case why do I need the mass of Pi 0...I guess I am terribly worng pls help
 

Answers and Replies

  • #2
vela
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The initial energy isn't just the sum of the rest energies because the protons are moving.

What about after the collision?

Hint: Use the 938 MeV/c2 for the mass of the proton. It'll make the calculations simpler — no unit conversions needed.
 
  • #3
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The initial energy isn't just the sum of the rest energies because the protons are moving.

What about after the collision?

Hint: Use the 938 MeV/c2 for the mass of the proton. It'll make the calculations simpler — no unit conversions needed.

I didnt get you...could you may be explain a bit more
 
  • #4
vela
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The total energy of a particle is equal to E=mc2+K, where K is the kinetic energy and m is the rest mass.
 

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