1) Symbol for Mass Number a) A b) Z c) N 2) Can the decay half-life of a radioactive material be changed? a) Yes b) No 3) Decay Rate is the activity of the sample a) True b) False 4) Time at which both N and R have been reduced to one-half their initial values. a) Mean Life b) Half Life 5) he estimated half-life of U-238 is __________ years a) 4.4 Billion years b) 4.5 Billion years c) 4.6 Billion years

NUCLEAR PHYSICS PART 1

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