Answer:
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.
'Frequency' is a word that often confuses some people ... for no good reason.
It just means "frequent-ness" or "often-ness" ... how often something happens.
The SI unit of frequency is the Hertz (Hz). Hz means 'per second'.
So " 13 Hz " means 13 per second.
Here are examples of frequency:
-- 780 kilohertz (on your AM radio dial)
-- 98.7 Megahertz (on your FM dial)
-- 5.8 Gigahertz
-- twice a day
-- three per week
-- every 6 months
The ! at the end of the word world. click that