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Energy of a photon absorbed by an elementary particle

  • Thread starter saridy
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  • #1
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Homework Statement


An elementary particle of mass M completely absorbs a photon, after which its mass is 1.01M.
a) What was the energy of the incoming photon?
b) Why is that energy greater than 0.01Mc2?


Homework Equations



E = mc2 or Δm = Δ E/c2
E = γmc2

The Attempt at a Solution



The only thing I can see doing is Δm = 1.01M - M = 0.01M = E/c2
But that gives E = 0.01Mc2 , which according to part b is not the answer. How do you solve this?
 

Answers and Replies

  • #2
3
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After further reading, I'll add these equations:
(mc2)2 = E2 - (pc)2
E = pc (for m = 0)
 
  • #3
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OKAY. so I got an answer of 0.01005Mc^2, so I'd appreciate if someone could check/correct that for me. I still don't know how to explain it in part b.
 

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