A radioactive source emits 2.4-MeV neutrons at the rate of 7100 neutrons per second. The number of atoms in the source is $2.6 \times 10 ^ { 9 }$ What is the activity of the source, in curies (Ci)? (1.00 Ci = 3.70 × 10¹⁰ Bq)

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The activity of the source is:$$A = \frac{dN}{dt} = 7100 	ext{ neutrons/s} = 7100 	ext{ Bq}$$Converting to curies:$$A = 7100 	ext{ Bq} 	imes \frac{1 	ext{ Ci}}{3.70 	imes 10^{10} 	ext{ Bq}} = 190 	ext{ nCi}$$

A Radioactive Source Emits 2 2.6×1092.6 \times 10 ^ { 9 }2.6×109

A Radioactive Source Emits 2 $2.6 \times 10 ^ { 9 }$