HSC Science (Electronics) 12th Board ExamMaharashtra State Board
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State the Law of Radioactive Decay. Hence Derive The Expression N = Noe^-λT Where Symbols Have Their Usual Meanings. - HSC Science (Electronics) 12th Board Exam - Physics

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Question

State the law of radioactive decay.

Solution

Law of radioactive decay:
The number of nuclei undergoing the decay per unit time is proportional to the number of unchanged nuclei present at that instant. 

If ‘N’ is the number of nuclei present at any instant ‘t’, ‘dN’ is the number of nuclei that disintegrated in short interval of time ‘dt’, then according to decay law,

`- (dN)/dt ∝ N`

`:.(dN)/dt = -lambda N`

where, `lambda` is known as decay constant or disintegration constant. The negative sign indicates disintegration of atoms.

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 2012-2013 (March) (with solutions)
Question 7.3 | 3.00 marks
 2015-2016 (July) (with solutions)
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Solution State the Law of Radioactive Decay. Hence Derive The Expression N = Noe^-λT Where Symbols Have Their Usual Meanings. Concept: Radioactivity - Law of Radioactive Decay.
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