Radioactive decay obeys which one of the following law ?
Correct answer: A. N=Noe-λt
- A. N=Noe-λt
- B. N=Noeλt
- C. N=Noe-λt/2
- D. No=N(1+eλt)
Explanation
Radioactive decay is exponential because the probability of decay per unit time is constant, giving N = N0e^-λt, where N and N0 are numbers of nuclei and λ has unit s^-1. The likely mistake is N = N0eλt, which describes exponential growth rather than the decrease in undecayed nuclei.
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About Radioactive Decay
Radioactive decay is the spontaneous transformation of unstable nuclei, described by decay constant, activity, half life and the exponential decay law. Work includes alpha, beta and gamma emissions, decay equations and remaining nuclei, with half life distinguished from the time required for complete decay.
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