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 these choices is correct.

Question

Quizplus · Accepted Answer

1 MeV is equivalent to 1.60218 * 10¯¹³ J. To convert 4.0 * 10¯¹³ J to MeV, divide by 1.60218 * 10¯¹³ J/MeV, which gives approximately 2.5 MeV.

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