Alpha particles are 

(1) 2 free protons

(2) helium atoms

(3) singly ionized helium atoms

(4) doubly ionised helium atoms

Concept Questions :-

Mass-energy equivalent
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A radioactive sample with a half-life of 1 month has the label: 'Activity = 2 microcurie on 1-8-1991'. What would be its activity two months earlier? 

(1) 1.0 microcurie       

(2) 0.5 microcurie           

(3) 4 microcurie             

(4) 8 microcurie

Concept Questions :-

Radioactivity
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If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by Fpp, Fnn and Fpn respectively, then [1991]

(1) FppFnnFpn

(2) FppFnn and Fpp=Fnn

(3) Fpp=Fnn=Fpn

(4) FppFnnFpn

Concept Questions :-

Nuclear binding energy
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A radioactive element has half-life period 800 yr. After 6400 yr, what fraction will remain? [1989]

(1) 12              (2) 116            (3) 18              (4) 1256

Concept Questions :-

Radioactivity
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If radius of the A1227l nucleus is taken to be RAl, then the radius of T53125e nucleus is nearly 

(1) 53RAl                  (2) 35RAl              (3) 13531/3RAl            (4) 53131/3RAl

Concept Questions :-

Mass-energy equivalent
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In a given reaction,

XAZYAZ+1KA-4Z-1KA-4Z-1

Radioactive radiations are emitted in the sequence of  

(1)  α, β, γ       (2) γ, α, β             (3) β, α, γ            (4) γ, β, α

Concept Questions :-

Radioactivity
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If a proton and anti-proton come close to each other and annihilate, how much energy will be released:

 (1) 1.5×10-10 J           

 (2) 3×10-10 J         

 (3) 4.5×10-10 J         

 (4) None of these

Concept Questions :-

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The stable nucleus that  has a radius half that of Fe56 is 

(1) Li7         (2) Na21          (3) S16          (4) Ca40

Concept Questions :-

Mass-energy equivalent
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The mass density of a nucleus varies with mass number A as [1992]

(1) A2               (2) A              (3) Constant         (4) 1A

Concept Questions :-

Mass-energy equivalent
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Energy released in the fission of a single U23592 nucleus is 200 MeV. The fission rate of a U23592 filled reactor operating at a power level of 5 W is 

(1) 1.56×10-10 s-1                   (2) 1.56×1011 s-1

(3) 1.56×10-16 s-1                   (4) 1.56×10-17 s-1

Concept Questions :-

Nuclear binding energy
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