Multiple Choice
What energy must be added or given off in a reaction where two hydrogen atoms and two neutrons are combined to form a helium atom? (Atomic masses for each: hydrogen,1.007 825 u;neutron,1.008 665 u;helium,4.002 602 u;also,1 u = 931.5 MeV/c2)
A) 74.85 MeV added
B) 74.85 MeV given off
C) 28.30 MeV given off
D) 28.30 MeV added
Correct Answer:
Verified
Correct Answer:
Verified
Q78: Approximately how many half-life periods must elapse
Q79: About what fraction of the initial activity
Q80: Certain stars at the end of their
Q81: A rad is that amount of radiation
Q82: The neutrino is<br>A)a little neutron.<br>B)another name for
Q83: The alpha emission process results in the
Q84: The mass of <sup>238</sup>U is not quite
Q86: A proton is captured by an oxygen-16
Q87: The mass of <sup>12</sup>C is 12 u
Q88: For every stable nucleus except hydrogen,if the