The activity of a radioactive material is 2.56 × 10-3 Ci. If the half life of the material is 5 days, after how many days the activity will become 2 × 10-5 Ci?
The activity of a radioactive material is 2.56 × 10-3 Ci. If the half life of the material is 5 days, after how many days the activity will become 2 × 10-5 Ci?
Option 1 -
30 days
Option 2 -
35 days
Option 3 -
40 days
Option 4 -
25 days
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1 Answer
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Correct Option - 2
Detailed Solution:A0 = 2.56 * 10-3Ci
A = 2 * 10-15Ci
A =
2n = 128
n = 7
t = 7 * t1/2
= 7 * 5 = 35 days
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