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Sunday, June 30, 2013

Half Life

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40.          Ra decays with a half-life of 1600s.
Rn decays with a half-life of 52s.
Po decays with a half-life of 9.1s.
Pb decays with a half-life of 10.6h.
The changing count rate for one of these radioactive nuclides is shown in the graph.


From the half-life shown by the graph, which was the decaying radioactive nuclide?
A. Ra      B. Rn     C. Po     D. Pb

Sol:
N=(1/2)^n X N0
N = Amount of radioisotope particles after nth half life.
N0 = Initial amount of radioisotope particles.
n = number of half life
Therefore:
N=1/2^1  X 66
=33


Count rate i.e. No. of particles is initially 66, hence its haf’ll be left after 1 half decay i.e. 33. & that as shown by graph comes at 52s so its Rn!
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Shamoeel, lives in Lahore, is a truthseeker and has a passion for getting and providing education in a manner that takes the students out of the tangled method and teaches them in simple, clear and relevant style.

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