Which sample, A or B shown in the figure

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Question:
Which sample, A or B shown in the figure has shorter mean-life?

dN/dt

A

B

T

Solution:

At t= 0, (dN/dt)A = (dN/dt)B

dN/dt = -λN

(No)A = (No)B

λANA = λBNB

Na > NB

λB > λA