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Sodium-21 Will Emit Positrons Each Having an Energy of 4

Question 14

Multiple Choice

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

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