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It is known that the decay rate of radiu...

It is known that the decay rate of radium is directly proportional to its quantity at each given instant. Find the law of variation of a mass of radium as a function of time if at t=0, the mass of the radium was `m_0` and during time `t_0` `alpha`% of the original mass of radium decay.

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The correct Answer is:
`m = m_0e^-kt where k = -1/t_@ ln (1- alpha/100)`
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MOTION-DIFFERENTIAL EQUATION -Exercise 3
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