The Activity of a Radioactive Sample Is the Number of Decay

Multiple Choice

The activity of a radioactive sample is the number of decay events per second. The SI unit of activity is the becquerel (1 Bq = 1/s) . An older unit for activity is the curie (1 Ci = 3.70  10¹⁰/s) . What is the activity in  Ci of a sample with an activity of 2.1 10 ⁵ Bq of radiation?

A) 7.8  10 ⁹ Ci
B) 5.7 Ci
C) 5.7  10 ^12 Ci
D) 5.7  10 ^6 Ci
E) 0.21 Ci