When a positronium atom decays, it emits two photons. What are ...

[APUS57]

When a positronium atom decays, it emits two photons. What are the energies of the photons?
 
  A) 0.225 MeV and 0.285 MeV
  B) 0.511 MeV and 1.022 MeV
  C) 0.256 MeV and 0.256 MeV
  D) 0.511 MeV and 0.511 MeV
  E) 1.02 GeV and 938. MeV

Question 2

An electron is accelerated through 100 kV. By what factor has its mass increased with respect to its rest mass?
 
  A) 4.25
  B) 1.20
  C) 8.00
  D) 1.55
  E)

[batool]

Answer to Question 1

D

Answer to Question 2

B

[APUS57]

Gracias!

[bassamabas]

TYSM