Question

the rate at which a radioactive isotope disntegrates is porportional to the amount present. if 30g sample will contain only 20g after 10 minutes, what is the half life of the isotope, correct to the nearest 10th. y=yoe^kt. :)

Answer 1

is y representing the half-life?

Answer 2

what is k?

Answer 3

i dont know thats why im asking.

Answer 4

k is the constant.

Answer 5

i got 0.3

Answer 6

0.3 minturesÉ i got 15.32

Answer 7

yes i got 0.3 mins.

Answer 8

how! can you step by step!?