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प्रश्न
What happens to the mass number of an element when an α -particle is emitted?
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उत्तर
When an α-particle is emitted, the mass number of the element decreases by 4, because the nucleus loses two protons and two neutrons.
संबंधित प्रश्न
Radioactive substances were found to give off three types of rays. Name them. How do they
(a) React to the magnetic field?
(b) React to the electric field?
(c) Act when different thickness of lead sheets is placed in their path?
Define free electrons.
What are the types of emission?
State any two uses of cathode rays.
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
What are ‘Becquerel rays’?
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z + 1}Y + ^0_{-1}β}\]
Assertion (A): Hydrogen atom consists of only one electron but its emission spectrum has may lines.
Reason (R): Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.
Which of the following correctly describes the properties of an alpha particle?
