Sodium-21 will emit positrons each having an energy of 4.0 × 10-13 J. What is this energy in MeV?
A) 4.0 × 10-7 MeV
B) 2.5 MeV
C) 40 MeV
D) 2.5 × 106 MeV
E) none of the above
Correct Answer:
Verified
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