Question

If you have 200 grams of a radioactive sample, how many grams would be left after three half-lives?
Select one:
a. 200
b. 150
c. 50
d. 25

Answer 1

200 * 1/2 = 100
100 *1/2 = 50
50 * 1/2 = 25

D. 25

Answer 2

thanks wish i can give a medal

Answer 3

np

Answer 4

i got a lot if you dont mind

Answer 5

ok

Answer 6

let me post them

Answer 7

Radioactive decay can be used to measure:
Select one:
a. time
b. length
c. circumference
d. density

Answer 8

A graph of exponential decay has ____________ on the x axis and ____________ on the y axis.
Select one:
a. Time; number of radioactive atoms
b. Radioactivity; time
c. Electrons; time
d. Time; neutrons

Answer 9

A, and i don't know about that 2nd one

Answer 10

thank you