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CBSE Class 12 Physics 2020 Delhi Set 2 Paper

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Question : 4 of 7
Marks: +1, -0
SECTION - B
(a) Define one Becquerel.
(b) A radioactive substance disintegrates into two types of daughter nuclei, one type with disintegration constant λ1 and the other type with disintegration constant λ2. Determine the half-line of the radioactive substance.
Solution:  
(a) Becquerel: One Becquerel is defined as the activity of a quantity of radioactive material in which one nucleus decays per second.
(b) λ=λ1+λ2
Or, ‌
0.693
T1∕2
=λ1+λ2
∴‌‌T1∕2=‌
0.693
λ1+λ2
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