Half life of a radioactive element is 10 days. The time during which quantity remains 1/10 of initial mass will be
(a) 100 days             (b) 50 days
(c) 33 days               (d) 16 days

Concept Questions :-

Radioactivity
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In the given nuclear reaction A, B, C, D, E represents
U92238αThBAβPaDCEU92234

(a) A = 234, B = 90, C = 234, D = 91, E = β
(b) A = 234, B = 90, C = 238, D = 94, E =α
(c) A = 238, B = 93, C = 234, D = 91, E = β
(d) A = 234, B = 90, C = 234, D = 93, E = α

Concept Questions :-

Types of decay
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If half life of a radioactive element is 3 hours, after 9 hours its activity becomes 
(a) 1/9                     (b) 1/27
(c) 1/6                     (d) 1/8

Concept Questions :-

Radioactivity
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The nucleus Cd48115 after two successive β- decays will give 
(a) Pa46115          (b) In49114
(c) Sn50113          (d) Sn50115

Concept Questions :-

Types of decay
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At any instant the ratio of the amount of radioactive substances is 2 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances 
(a) 1 : 1                 (b) 2 : 1
(c) 1 : 2                 (d) 1 : 4

Concept Questions :-

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

Concept Questions :-

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

Concept Questions :-

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

Concept Questions :-

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%

Concept Questions :-

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

Concept Questions :-

Radioactivity
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