Radioactivity was discovered by
(a) Becquerel            (b) Pierre Curie
(c) Roentgen             (d) Rutherford

Concept Questions :-

Radioactivity
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The average life T and the decay constant λ of a radioactive nucleus are related as 
(a) =1               (b) T=0.693λ
(c) Tλ=1               (d) T=cλ

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Radioactivity
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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 
(a) 12              (b) 34
(c) 12           (d) 2-12

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If the decay or disintegration constant of a radioactive substance is λ, then its half life and mean life are respectively 
(a) 1λ and  loge2λ              (b) loge2λ and 1λ

(c) λloge2 and 1λ               (d) λloge2 and 1λ

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Which of the following is in the increasing order for penetrating power 
(a) α,β,γ                (b) β,α,γ
(c) γ,α,β                (d) γ,β,α

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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

(a) 12 days                  (b) 32 days
(c) 60 days                  (d) 64 days

Concept Questions :-

Radioactivity
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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 
(a) 3.4 days               (b) 10 days
(c) 15 days                (d) 20 days

Concept Questions :-

Radioactivity
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Radioactivity is
(a) Irreversible process             (b) Self disintegration process
(c) Spontaneous process           (d) All of the above

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Radioactivity
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Half life of radioactive element depends upon

(a) Amount of element present
(b) Temperature
(c) Pressure
(d) Nature of element

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Radioactivity
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The decay constant of radium is 4.28×10-4 per year. Its half life will be 
(a) 2000 years        (b) 1240 years
(c) 63 years            (d) 1620 years

Concept Questions :-

Types of decay
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