Which missing item would complete this alpha decay reaction

Explanation:

Alpha decay: When a larger nuclei decays into smaller nuclei by releasing alpha particle. In this process, the mass number and atomic number is reduced by 4 and 2 units respectively.

General representation of alpha decay :

The atomic number and mass number should be same on both sides of the nuclear equation and thus for the given reaction:

thermal energy is the answer

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr