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If $N_{1} = N_{0} e^{- λ t_{1}}$ then the number of atoms decayed during time interval from $t_{1}$ to $t_{2}$ $(t_{2} > t_{1})$ will be

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$N_{t_{1}} - N_{t_{2}} = N_{0} [e^{- λ t_{1}} - e^{- λ t_{2}}]$

$N_{t_{2}} - N_{t_{1}} = N_{0} [e^{- λ t_{2}} - e^{λ t_{1}}]$

$N_{t_{2}} - N_{t_{1}} = N_{0} [e^{- λ t_{2}} - e^{- λ t_{1}}]$

None of the above

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Detailed Solution

$N_{t_{1}} = N_{0} e^{- λ t_{1}} N_{t_{2}} = N_{0} e^{- λ t_{2}}$

No. of atoms decayed during time interval $t_{1} t o t_{2}$ is

$= N_{t_{1}} - N_{t_{2}} = N_{0} [e^{- λ t_{1}} - e^{- λ t_{2}}]$

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