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Standard X

Physics

Properties of Alpha, Beta and Gamma Radiations

The phenomeno...

Question

The phenomenon explained by tunnel effect is

β

-decay

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α

-decay

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γ

-decay

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All the above

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Solution

The correct option is A $α$ -decay
In nuclear physics the tunnel effect explain the alpha decay of radioactive nuclei. As a result of the joint action of short-range nuclear forces of attraction and electrostatic (Coulomb) forces of repulsion, an alpha particle must pass across a three-dimensional potential barrier.

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Similar questions

Q. In which of the following decays the atomic number decreases?
(a) α-decay
(b) β⁺-decay
(c) β⁻-decay
(d) γ-decay

Q. In which of the following decays the element does not change?
(a) α-decay
(b) β⁺-decay
(c) β⁻-decay
(d) γ-decay

Q. Assertion :

{_{z} X}^{A}

undergoes

2

α

- decays,

2

β

- decays (negative

β

) and

2

γ

-decays. As a result , the daughter product is

{_{z - 2} Y}^{A - 8}

Reason: In

α

- decay, the mass number decreases by

4

unit and atomic number decreases by

2

unit. In

β

- decay (negative

β

), the mass number remains unchanged and atomic number increaess by

1

unit. In

γ

-decay, mass number and atomic number remain unchanged

Q. STATEMENT - 1 :

_{Z} X^{A}

undergoes 2

α

decays, 2

β

decays (negative

β

) and 2 decays. As a result the daughter product is

_{Z - 2} Y^{A - 8} .

STATEMENT -2 : In

α

decay the mass number decreases by 4 unit and atomic number decreases by 2 unit. In

β

decay (negative

β

) the mass number remains unchanged and atomic number increases by 1 unit. In

γ

decay, mass number and atomic number remains unchanged.

Q. Assertion :

γ

-radiation emission occurs after

α

and

β

decay. Reason: Energy levels occur in nucleus.

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