Unit of radioactivity is Rutherford. Its value is

(a) 3.7×1010 disintegrations/sec
(b) 3.7×106 disintegrations/sec
(c) 1.0×1010disintegrations/sec
(d) 1.0×106 disintegrations/sec

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Radioactivity
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A radioactive substance has a half life of 60 minutes. After 3 hours, the fraction of atom that have decayed would be

(a) 12.5%               (b) 87.5%
(c) 8.5%                 (d) 25.1%

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Radioactivity
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An element used for radioactive carbon dating for more than 5600 years is 
(a) C-14          (b) U-234
(c) U-238        (d) Po-94

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Radioactivity
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N atoms of a radioactive element emit n alpha particles per second. The half life of the element is

(a) nN sec                    (b) Nn sec
(c) 0.693 Nn sec           (d)  0.693 nN sec

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Radioactivity
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The radioactive nucleus N713 decays to C613 through the emission of 
(a) Neutron              (b) Proton
(c) Electron              (d) Positron

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Radioactivity
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The radioactive decay of uranium into thorium is expressed by the equation U92238Th90234+X where 'X' is

(a) An electron                (b) A proton
(c) A deuteron                 (d) An alpha particle

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Radioactivity
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In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following would be emitted in the decay process 
(a) Proton              (b) Neutron
(c) Electron            (d) Photon

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Radioactivity
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The half life (T) and the disintegration constant λ of a radioactive substance are related as
(a) λT=1                     (b) λT=0.693
(c) Tλ=0.693              (d) λT=0.693

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Radioactivity
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The half life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be

(a) 93.75%                  (b) 75%
(c) 25%                       (d) 6.25%

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Radioactivity
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In the uranium radioactive series, the initial nucleus is U92238 and the final nucleus is Pb82206. When the uranium nucleus decays to lead, the number of  α-particles emitted will be 
(a) 1                (b) 2
(c) 4                (d) 8

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Types of decay
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