A Radioactive Source Emits $2.4 - \mathrm { MeV }$ Neutrons at the Rate of 7100 Neutrons Per Second

Multiple Choice

A radioactive source emits $2.4 - \mathrm { MeV }$ 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) ? $( 1.00 \mathrm { Ci } = 3.70 \times$ $10 ^ { 10 } \mathrm {~Bq}$ )

A) $710 \mathrm { nCi }$
B) $190 \mathrm { nCi }$
C) $1900 \mathrm { nCi }$
D) $71 \mathrm { nCi }$
E) $19 \mathrm { nCi }$