Plutonium (pu. z half-life of 90 years (2.7 x 10' sec). 94) has been used as power source in space flights. pu has an a-decay (a) what are the z and of the nucleus which remains after a-decay? (b) why is 2spu more likely to emit a's than deuterons as radiation? (e) each of the a-particles is emitted with 5.5 mev. what is the power released if there are 238 grams of pu (6 x 10atoms)? (use any units you wish but specify.) hint: use p esano