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A radioactive element A. Starting from a sample of pure element A, which one of the following graphs correctly shows the number of A atoms N_A with ti
Question

A radioactive element A. Starting from a sample of pure element A, which one of the following graphs correctly shows the number of A atoms N_A with time t? T is the half-life of element A.

A.

B.

C.

D.

​

Correct option is D

Correct answer is D
Explanation
Starting from a sample of pure radioactive element A,  N = N0 exp(-λt) 

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