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Sameedha Abbas Kapoor
Asked: 2022-10-29T05:45:44+05:30 In:

A radioactive substance is being consumed at a constant of `1 s^(-1)`. After what time will the number of radioactive nuclei becoem `100`. Initially, there were 200 nuceli present.
A. 1 sec
B. 2 sec
C. In (2) sec
D. `(1)/(In (2)) sec`

A radioactive substance is being consumed at a constant of `1 s^(-1)`. After what time will the number of radioactive nuclei becoem `100`. Initially, there were 200 nuceli present.
A. 1 sec
B. 2 sec
C. In (2) sec
D. `(1)/(In (2)) sec`
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1 Answer

  1. Correct Answer – b
    `N = N_(0) e^(-lambda t)`
    `100 = 200 e^(-1 xx t)`
    `(1)/(2) = e^(-t)`
    t = In (2) sec

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