222Ra is a naturally occurring radioisotope that can build up in homes. Calculate the rate constant for the first‐order decay of 222Ra. ( t1/2 = 3.30 x 105 s)
A) 2.29 x 105 s‐1
B) 2.1 x 10‐6 s‐1
C) 12.7 s‐1
D) 3.03 x 10‐6 s‐1
E) 4.37 x 10‐6 s‐1
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