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

Concept Questions :-

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

Concept Questions :-

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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Which of the following is not a mode of radioactive decay

(a) Positron emission           (b) Electron capture
(c) Fusion                           (d) Alpha decay

Concept Questions :-

Radioactivity
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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 
(a) α=3, β = 3        (b) α = 6, β = 4
(c) α=6, β=0          (d) α=4, β=6

Concept Questions :-

Types of decay
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A sample contains 16 gm of a radioactive material, the half life of which is two days. After 32 days, the amount of radioactive material left in the sample is

(a) Less than 1 mg         (b) 14gm 
(c) 12gm                       (d) 1 gm

Concept Questions :-

Radioactivity
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