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Q.

1 g of a radio active substance disintegrates at the rate of 3.7 × 1010 disintegrations per second. The atomic mass of the substance is 226. Calculate its mean life.

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a

1.2 × 105 s

b

1.39 × 1011s

c

2.1 × 105 s

d

7.194 × 1010 S

answer is D.

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Detailed Solution

Nλ=3.7×1010    N=1226×6×1023  Tmean=1λ
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