Cesium- 137 Undergoes Beta Decay and Has a Half- Life

Multiple Choice

Cesium- 137 undergoes beta decay and has a half- life of 30 years. How many beta particles are emitted by a 14.0- g sample of cesium- 137 in three minutes?

A) 8.1 × 10¹⁵
B) 6.2 × 10²²
C) 6.1 × 10¹³
D) 8.4 × 10¹⁵
E) 1.3 × 10^{- 8}