Which of the following isotopes is used for the treatment of cancer 
(a) K40         (b) Co60
(c) Sr90        (d) I131

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Radioactivity
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If half-life of a radioactive atom is 2.3 days, then its decay constant would be 
(a) 0.1            (b) 0.2
(c) 0.3            (d) 2.3

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Radioactivity
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A radioactive element X90238 decay into Y83222. The number of β-particles emitted are

(a) 4             (b) 6
(c) 2             (d) 1

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Radioactivity
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A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in 150 years will be

(a) 66.6%               (b) 85.5%
(c) 62.5%               (d) 75%

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Radioactivity
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An artificial radioactive decay series begins with unstable Pu94241. The stable nuclide obtained after eight α decays and five β-decays is 
(a) Bi83209          (b) Pb82209
(c) Ti82205          (d) Hg82201

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Radioactivity
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The activity of a sample is 64×10-5 Ci. Its half-life is 3 days. The activity will become 5×10-6 Ci after 
(a) 12 days          (b) 7 days
(c) 18 days          (d) 21 days

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Radioactivity
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The half-life of radon is 3.8 days. Three forth of a radon sample decay in
(a) 5.02 days         (b) 15.2 days
(c) 7.6 days           (d) 11.4 days

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Radioactivity
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A nucleus of an element X84202 emits an α-particle first, a β-particle next and then a gamma photon. The final nucleus formed has an atomic number 
(a) 200            (b) 199
(c) 83              (d) 198

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Types of decay
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Plutonium decays with a half-life of 24000 years. If the plutonium is stored for 72000 years, then the fraction of plutonium that remains is 
(a) 12           (b) 13
(c) 14           (d) 18

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Radioactivity
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A radioactive substance emits 
(a) α-rays                (b) β-rays
(c) γ-rays                 (d) All of these

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Types of decay
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