# Physical Science

1. Which equation correctly shows beta decay?
(A) 210/82 Pb -> 209/81 Tl + 0/-1 e + y
(B) 210/82 Pb -> 209/83 Bi + 0/-1 e + y
(C) 210/82 Pb -> 210/83 Tl + 0/-1 e + y
(D) 210/82 Pb -> 210/83 Bi + y
(E) 210/82 Pb -> 210/83 Bi + 0/-1 e + y

2. The half-life if radon-222 is 3.8 days. If a sample currently has 3.1 grams of radon-222, how much radon-222 did this sample have 15.2 days ago?

(A) 12.4 grams
(B) 47.1 grams
(C) 49.6 grams
(D) 57.8 grams
(E) 92.7 grams

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1. (E) 210/82 Pb -> 210/83 Bi + 0/-1 e + y
(C) 49.6 grams

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2. (E) 210/82Pb-> 210/83Bi + 0/-1e +Y
(A) 12.4 grams

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3. djikopp[

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