The average life T and the decay constant λ of a radioactive nucleus are related as 

(1) =1               

(2) T=0.693λ

(3) Tλ=1               

(4) T=cλ

Subtopic:  Radioactivity (OLD NCERT) |
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If T is the half life of a radioactive material, then the fraction that would remain after a time T2 is 
(1) 12             

(2) 34
(3) 12           

(4) 2-12

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Which of the following is in the increasing order for penetrating power 

(1) α,β,γ               

(2) β,α,γ

(3) γ,α,β               

(4) γ,β,α

Subtopic:  Types of Decay |
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The half life of a radioactive element which has only 132 of its original mass left after a lapse of 60 days is

(1) 12 days                 

(2) 32 days

(3) 60 days                 

(4) 64 days

Subtopic:  Radioactivity (OLD NCERT) |
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The half-life of Bi210 is 5 days. What time is taken by (7/8)th part of the sample to decay 

(1) 3.4 days               

(2) 10 days

(3) 15 days               

(4) 20 days

Subtopic:  Radioactivity (OLD NCERT) |
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Radioactivity is

(1) Irreversible process             

(2) Self disintegration process

(3) Spontaneous process           

(4) All of the above

Subtopic:  Radioactivity (OLD NCERT) |
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Half life of radioactive element depends upon

(1) Amount of element present 

(2) Temperature

(3) Pressure

(4) Nature of element

Subtopic:  Radioactivity (OLD NCERT) |
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The decay constant of radium is 4.28×10-4 per year. Its half life will be 

(1) 2000 years       

(2) 1240 years

(3) 63 years           

(4) 1620 years

Subtopic:  Types of Decay |
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Which of the following is not a mode of radioactive decay

(1) Positron emission           

(2) Electron capture

(3) Fusion                         

(4) Alpha decay

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Atomic mass number of an element thorium is 232 and its atomic number is 90. The end product of this radioactive element is an isotope of lead (atomic mass 208 and atomic number 82). The number of alpha and beta particles emitted is

 
(1) α=3, β = 3       

(2) α = 6, β = 4

(3) α=6, β=0         

(4) α=4, β=6

Subtopic:  Types of Decay |
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