2. For a radioactive material, the number of atoms of a radioactive element decr

Question

2. For a radioactive material, the number of atoms of a radioactive element decreases like N(t) = N0e-t/ where N0 is the number of atoms of that element present at time t = 0 and is a parameter with units of time representing the time it takes for the number of atoms to decrease by a factor of 1/e. Two radioactive materials start at time t = 0 with the same number of atoms. The graphs at the right show how their numbers fall with time. Which element, A or B, has the larger value of ?

a. A

b. B

c. They are same

d. Not enough info to tell.

Explain how you decided.

Explanation / Answer

Here the number of decayed atoms are less in sample A than B at any later time. i.e. the B decays faster than A so A has more tau value than B.

Ans: A

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