Po-210 undergoes alpha decay. The energy released can be used to produce electricity for deep space probe where sunlight is not enough to generate electricity. Assume the heat to electricity conversion efficiency is 15%. a) Write the Po-210 decay equation. b) The probe is dead if the electrical power is lower than 1 W. If the space mission is 3.5 years long, how many grams of Po-210 are needed at launch time? Po-210 half-life is 138.376 days.