Answer :


The decay constant of 238U is 4.9 × 10–18 s–1

a) Average life

b) Half life

c) 9 × 109 years = 2 half-lives(approximately)

We know

where A= Activity of the substance

A0 = Initial activity

N = number of half lives

N = 2, in this case.

So it is evident that the sample activity will decrease by a factor of 4

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