Asample contains 36g of a radioactive isotope. how much radioactive isotope remains in the sample after 3 half-lives

4.5 g

Explanation:

N0 = 36 g, Let half life is T.

t = 3 T, n is number of half lives = t / T = 3

By using the decay law of radioactivity

N / N0 = (1 / 2)^n

where, N0 be the initial amount

N be the amount left

n be the number of half lives

N / 36 = (1/2)^3

N / 36 = 1 / 8

N = 36 / 8 = 4.5 g

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic