Q.

A radioactive element has half-life period 700 yr’s. After 4200 yr’s what amount will remain?

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a

1/16

b

1/32

c

1/64

d

1/128

answer is C.

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Detailed Solution

Number of atoms left after n-half-lifes is given N=N012n ⇒NN0=12n Number of half-lifes = n=t/T=4200/700=6 ⇒NN0=126=164
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A radioactive element has half-life period 700 yr’s. After 4200 yr’s what amount will remain?