An alphavoltaic nuclear battery designed for a deep-space micro-probe contains a radioisotope source with an activity of 150 MBq150\text{ MBq}150 MBq. The kinetic energy of each emitted alpha particle is 5.0 MeV5.0\text{ MeV}5.0 MeV.
What is the total rate of thermal energy released by this source?
1.2×10−10 W1.2 \times 10^{-10}\text{ W}1.2×10−10 W
1.2×10−4 W1.2 \times 10^{-4}\text{ W}1.2×10−4 W
7.5×1014 W7.5 \times 10^{14}\text{ W}7.5×1014 W
1.2×10−16 W1.2 \times 10^{-16}\text{ W}1.2×10−16 W
