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Q.

A sample radio active subsistence has 106 radio active nuclei. It's half-life is 20 sec. How many nuclei will remain after 10 seconds?

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a

7 × 105

b

8.5 × 105

c

8 × 105

d

7.5 × 105

answer is A.

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Detailed Solution

N=N02t/T=106210/20=10621/2 ∴N=1062=0.707 x 106=7 x 105
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