How Do You Find the Total Energy and Speed of a Relativistic Particle?

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SUMMARY

The discussion focuses on calculating the total energy and speed of a relativistic particle with a mass of 5 GeV/C² and momentum of 5 GeV/c. The relevant equations include E=λmc² and p=λmu, where λ is the Lorentz factor defined as λ=(√(1-(u/c)²))^-1. The participant struggles to isolate the speed (u) due to the dependency of λ on u, and a correction is made regarding the incorrect assertion that p/m=c. The solution requires a deeper understanding of the relationship between energy, momentum, and mass in relativistic contexts.

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  • Knowledge of energy-momentum relationships
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Homework Statement



Mass of particle = 5GeV/C^2
Momentum of particle = 5GeV/c

Find total energy of particle and speed of particle.

Homework Equations



E=λmc^2
p=λmu
λ=(√(1-(u/c)^2))^-1

The Attempt at a Solution



When I try so solve for speed, I realize λ is a function of u, so get this:

(u*(√(1-(u/c)^2))^-1) = p/m = c, but can't solve for u from that.

How would I go about approaching this problem?
 
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Try finding another relationship between E, p, and m in your textbook.

You can solve for u in your approach, but your assertion that p/m=c isn't correct.
 

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