The nucleus U92234 splits exactly in half in a fission reaction in which two neutrons are released. The resultant nuclei are

(1) Pd46116        

(2) Rh45117

(3) Rh45116       

(4) Pd46117

Subtopic:  Radioactivity (OLD NCERT) |
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A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called 

(1) Artificial radioactivity         

(2) Fusion

(3) Fission                               

(4) Radioactivity

Subtopic:  Radioactivity (OLD NCERT) |
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Which of the following cannot cause fission in a heavy nucleus 

(1) α-particle         

(2) Proton

(3) Deutron             

(4) Laser rays

Subtopic:  Radioactivity (OLD NCERT) |
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 If the mass number of an atom is A = 40 and its electron configuration is 1s22s22p63s23p6, the number of neutrons and protons in its nucleus will be 

(1) 22, 18           

(2) 18, 22

(3) 20, 20           

(4) 18, 18

Subtopic:  Mass-Energy Equivalent |
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Which of the following is most unstable

(1) Electrons           

(2) Protons

(3) Neutrons           

(4) α-particle

Subtopic:  Radioactivity (OLD NCERT) |
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 Radioactive substance do not emit

(1) Electron           

(2) Helium nucleus

(3) Positron         

(4) Proton

Subtopic:  Radioactivity (OLD NCERT) |
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During a negative beta decay 

1. An atomic electron is ejected
2. An electron which is already present within the nucleus is ejected
3. A neutron in the nucleus decays emitting an electron
4. A part of the binding energy is converted into electron
Subtopic:  Types of Decay |
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Some radioactive nucleus may emit

(1) Only one α,β or γ at a time

(2) All the three α,β and γ one after another

(3) All the three α,β and γ simultaneously

(4) Only α and β simultaneously

Subtopic:  Types of Decay |
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Which can pass through 20 cm thickness of the steel

(1) α particles                   

(2) β particles

(3) γ rays                         

(4) Ultraviolet rays

Subtopic:  Types of Decay |
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The half-life period of radium is 1600 years. Its average life time will be 
(a) 3200 years              (b) 4800 years
(c) 2319 years               (d) 4217 years

Subtopic:  Radioactivity (OLD NCERT) |
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