The half-life of radon is 3.8 days. Three forth of a radon sample decay in
(a) 5.02 days         (b) 15.2 days
(c) 7.6 days           (d) 11.4 days

Concept Questions :-

Radioactivity
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A nucleus of an element X84202 emits an α-particle first, a β-particle next and then a gamma photon. The final nucleus formed has an atomic number 
(a) 200            (b) 199
(c) 83              (d) 198

Concept Questions :-

Types of decay
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Plutonium decays with a half-life of 24000 years. If the plutonium is stored for 72000 years, then the fraction of plutonium that remains is 
(a) 12           (b) 13
(c) 14           (d) 18

Concept Questions :-

Radioactivity
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A radioactive substance emits 
(a) α-rays                (b) β-rays
(c) γ-rays                 (d) All of these

Concept Questions :-

Types of decay
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The large scale destruction, that would be caused due to the use of nuclear weapons is called 
(a) Nuclear holocaust
(b) Thermo-nuclear reaction
(c) Nuetron reproduction factor
(d) None of these

Concept Questions :-

Nuclear reactor
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An atomic nucleus Th90232 emits several α and β radiations and finally reduces to Pb82208. It must have emitted

(a) 4α and 2β              (b) 6α and 4β
(c) 8α and 24β            (d) 4α and 16β

Concept Questions :-

Types of decay
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A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be

(a) 132              (b) 15
(c) 12                (d) 45

Concept Questions :-

Radioactivity
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If half-life of a substance is 3.8 days and its quantity is 10.38 gm. Then substance quantity remaining left after 19 days will be 
(a) 0.151 gm             (b) 0.32 gm
(c) 1.51 gm               (d) 0.16 gm

Concept Questions :-

Radioactivity
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Which is the correct expression for half-life

(a) t1/2=log2                  (b) t1/2=λlog2
(c) t1/2=λlog2(2.303)      (d) t1/2=2.303 log 2λ

Concept Questions :-

Radioactivity
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A nucleus AZA emits an α-particle. The resultant nucleus emits a β+ particle. The respective atomic and mass no. of the final nucleus will be 
(a) Z – 3, A – 4            (b) Z – 1, A – 4
(c) Z – 2, A – 4            (d) Z, A – 2

Concept Questions :-

Types of decay
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