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please answer this

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Asked by Prashant DIGHE 15th January 2020, 10:16 PM
Answered by Expert
Answer:
For radioactive decay, rate of disintegration is proportional to number of undecayed atoms present.
 
dN/dt = -λN ........................... ( 1 )
 
where λ is decvay constant, -ve sign indicates rate of disinegeration decreases.
 
we have radioactive decay equation as,  N = No e-λt .....................(2)
 
where No is the number of undecayed atoms present at t=0.
 
hence from eqn.(1) and (2), we get, | dN/dt | = λ No e-λt
 
Hence figure (4) shows the correct variation of rate of disintegration as a function of time.
 
Answered by Expert 15th January 2020, 10:57 PM
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