Fermium-253 has a half life of three days. a sample contains 400 g. how long will it take for the sample to decay to 100 g? number of half lives: 1, 2, 3, or 6? number of days: 3, 4, 5, or 6?

Number of half-lives= 2    Number of days= 6

How many grams of fermium will remain after fifteen days= 12.5

What formula would you use to calculate the mass of fermium-253 remaining after d days= option B (f(d)=400(0.794)d)

How many grams of fermium will remain after twenty-three days= 1.986 g

Step-by-step explanation:

on edge, just completed assignment.

hope this helps

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )