Question

A certain radioactive element has a half-life of one hour. If you start with 1.0 gram of the element at noon, how much of the radioactive element will be left at 2 p.m.?

0.50 grams

0.25 grams

0.125 grams

0.0 grams

Answer 1

what you think :)

Answer 2

i think its 0.25g im not to sure

Answer 3

yaaa ur right
see at 12 Pm or noon 1 gram is there
since 1 hr is half time where it get converted to half of initial value
at 1pm = 1/2 =0.5 gram
then at 2 pm 0.5/2 =0.25 gram
ur right :)

Answer 4

ohh hmm thought so, thank you!!(:

Answer 5

yw:)

Answer 6

it is 0.25 as time is 2 hours then there are two half lives.1?2=0.5......0.5/2=0.25