I'm not sure what your question is. But, the half life is the amount of time required for half the material to decay. For U238 this is 4.5 billion years, whilst for Fr-223 (Francium) its about 22 minutes. To calculate the time for something to decay you need to use the equation:
Mass (after time t) = Mass (initial) * (0.5)^(time/half life)
Hope this helps
D cause u can measure how powerful that wave was
Wind energy i think, but im not for sure
ANSWER: NATURE
EXPLAINTION:
Answer:
true
Explanation:
you don't need an explanation