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
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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