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 :-

Mass-energy equivalent
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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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In one α and 2 β-emissions [1999]

(1) mass number reduced by 2

(2) mass number reduces by 6 

(3) atomic number reduces by 2

(4) atomic number remains unchanged

Concept Questions :-

Types of decay
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Which of the following is used as a moderator in nuclear reactors? 

(1) Plutonium        (2) Cadmium          (3) Heavy water         (4) Uranium 

Concept Questions :-

Nuclear reactor
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Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is 

(1) to control energy released in the reactor

(2) to absorb neutrons and stop the chain reaction

(3) to cool the reactor

(4) to slow down the neutrons to thermal energies

Concept Questions :-

Nuclear reactor
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Determine the energy released in the process :

H21+H21H2e4+Q

Given :M H21= 2.01471 amu

           MH2e4= 4.00388 amu

(1) 3.79 MeV              (2) 13.79 MeV               (3) 0.79 MeV           (4) 23.79 MeV

Concept Questions :-

Mass-energy equivalent
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