Radioactive substance do not emit

(a) Electron           (b) Helium nucleus
(c) Positron           (d) Proton

Concept Questions :-

Radioactivity
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During a negative beta decay 
(a) An atomic electron is ejected
(b) An electron which is already present within the nucleus is ejected
(c) A neutron in the nucleus decays emitting an electron
(d) A part of the binding energy is converted into electron

Concept Questions :-

Types of decay
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Some radioactive nucleus may emit
(a) Only one α,β or γ at a time
(b) All the three α,β and γ one after another
(c) All the three α,β and γ simultaneously
(d) Only α and β simultaneously

Concept Questions :-

Types of decay
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Which can pass through 20 cm thickness of the steel

(a) α particles                   (b) β particles
(c) γ rays                         (d) Ultraviolet rays

Concept Questions :-

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

Concept Questions :-

Radioactivity
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What percentage of original radioactive atoms is left after five half lives 
(a) 0.3%                (b) 1%
(c) 31%                  (d) 3.125%

Concept Questions :-

Radioactivity
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Beta rays emitted by a radioactive material are

(a) Electromagnetic radiation
(b) The electrons orbiting around the nucleus
(c) Charged particles emitted by nucleus
(d) Neutral particles

Concept Questions :-

Types of decay
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Alpha rays emitted from a radioactive substance are

(a) Negatively charged particles
(b) Ionised hydrogen nuclei
(c) Doubly ionised helium atom
(d) Uncharged particles having the mass equal to proton

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Half life of Bi210 is 5 days. If we start with 50,000
atoms of this isotope, the number of atoms left over after 10
days is 
(a) 5,000                (b) 25,000
(c) 12,500              (d) 20,000

Concept Questions :-

Radioactivity
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A nucleus of atomic mass A and atomic number Z emits β-particles. The atomic mass and atomic number of the resulting nucleus are 
(a) A, Z              (b) A + 1, Z
(c) A, Z + 1        (d) A-4, Z-2 

Concept Questions :-

Types of decay
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