If N 0 is the initial mass of a substance with half-life t 1 2 = 5 y e a r s , then the amount of substance left after 15 y e a r s is

Question

If N 0 is the initial mass of a substance with half-life t 1 2 = 5 y e a r s , then the amount of substance left after 15 y e a r s is, N 0 8, N 0 16, N 0 2, N 0 4

MARKS App · Accepted Answer

N 0 is the initial amount of substance and N is the amount left after decay. Thus, N = N 0 1 2 n n = no. of half lives = t t 1 / 2 = 1 5 5 = 3 Therefore, N = N 0 1 2 3 = N 0 8

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