Half life of a radioactive element is 10 days. The time during which quantity remains 1/10 of initial mass will be

(1) 100 days             

(2) 50 days

(3) 33 days               

(4) 16 days

Subtopic:  Radioactivity (OLD NCERT) |
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In the given nuclear reaction A, B, C, D, E represents
U92238αThBAβPaDCEU92234

(1) A = 234, B = 90, C = 234, D = 91, E = β

(2) A = 234, B = 90, C = 238, D = 94, E =α

(3) A = 238, B = 93, C = 234, D = 91, E = β

(4) A = 234, B = 90, C = 234, D = 93, E = α

Subtopic:  Types of Decay |
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If half life of a radioactive element is 3 hours, after 9 hours its activity becomes 

(1) 1/9                     

(2) 1/27

(3) 1/6                     

(4) 1/8

Subtopic:  Radioactivity (OLD NCERT) |
 80%
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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?

(1) 1 : 1                 

(2) 2 : 1

(3) 1 : 2                 

(4) 1 : 4

Subtopic:  Radioactivity (OLD NCERT) |
 66%
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Which of the following isotopes is used for the treatment of cancer 

(1) K40        

(2) Co60

(3) Sr90       

(4) I131

Subtopic:  Radioactivity (OLD NCERT) |
 61%
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If half-life of a radioactive atom is 2.3 days, then its decay constant would be 

(1) 0.1           

(2) 0.2

(3) 0.3           

(4) 2.3

Subtopic:  Radioactivity (OLD NCERT) |
 81%
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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

(1) 66.6%               

(2) 85.5%

(3) 62.5%               

(4) 75%

Subtopic:  Radioactivity (OLD NCERT) |
 82%
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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 

(1) Bi83209         

(2) Pb82209

(3) Ti82205         

(4) Hg82201

Subtopic:  Radioactivity (OLD NCERT) |
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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 

(1) 12 days         

(2) 7 days

(3) 18 days         

(4) 21 days

Subtopic:  Radioactivity (OLD NCERT) |
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The half-life of radon is 3.8 days. Three forth of a radon sample decay in

(1) 5.02 days         

(2) 15.2 days

(3) 7.6 days           

(4) 11.4 days

Subtopic:  Radioactivity (OLD NCERT) |
 83%
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