A100.0 gram sample of polonium-210 is contained for 552 days. how many half-lives occur during this period of time, if the half-life is 138 days?

4 half-lives will occur during this period of time.

Explanation:

Formula used :

where,

a = amount of reactant left after n-half lives and time t

= Initial amount of the reactant.

decay constant

= half life of an isotope

n = number of half lives

We have :

a = ?

t = 552 days

n = 4

4 half-lives will occur during this period of time.

truck y has a greater velocity than truck x.