Topic: Nuclear Chemistry

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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  C
Explanation:  

It is a neutron induced fission reaction.


Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  D
Explanation:  
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Q:

Consider an -particle just in contact with a 238U92 nucleus.Calculate the coulombic repulsion energy (i.e. the height of the coulombic barrier between U238 and alpha particle) assuming that the distance between them is equal to the sum of their radii

(a) :  
(b) :  
(c) :  
(d) :  
Answer:  41017_option1_27 option a.png click to enlarge
Explanation:  
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Q:

A first order nuclear reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed

(a) :  5 hours
(b) :  7.5 hours
(c) :  10 hours
(d) :   20 hours
Answer:  7.5 hours
Explanation:  
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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  A
Explanation:  
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Q:

A radioactive sample has a half-life of 1500 years.A sealed tube containing 1gm of the sample will contain after 3000 years

(a) :  1gm of the sample
(b) :  0.5gm of the sample
(c) :  0.25gm of the sample
(d) :   0.00gm of the sample
Answer:  0.25gm of the sample
Explanation:  
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Q:

If 1 microgram of radium has disintegrated for 500 years, how many alpha particles will be emitted per second

(a) :  
(b) :  
(c) :  
(d) :  
Answer:  40997_option0_ click to enlarge
Explanation:  
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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  C
Explanation:  
click to enlarge

Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  C
Explanation:  
click to enlarge
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