Question:
The mass of $\beta$-particles when they are emitted is higher than the mass of electrons obtained by other means.
$\beta$-particle and electron, both are similar particles.
The mass of $\beta$-particles when they are emitted is higher than the mass of electrons obtained by other means.
$\beta$-particle and electron, both are similar particles.
Updated On: Jul 6, 2022
- Both assertion and reason are true and reason is the correct explanation of assertion
- Both assertion and reason are true but reason is not the correct explanation of assertion
- Assertion is true but reason is false
- Both assertion and reason are false
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The Correct Option is B
Solution and Explanation
$\beta$-particles are emitted with very high velocity (up to 0.99 c).
So, according to Einstein's theory of relativity, the mass of a
$\beta$-particle is much higher compared touts rest, mass $(m_0)$. The velocity of electrons obtained by other means is very small compared to c (velocity of light). so, its mass remains nearly $m_0$.
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Concepts Used:
Nuclei
In the year 1911, Rutherford discovered the atomic nucleus along with his associates. It is already known that every atom is manufactured of positive charge and mass in the form of a nucleus that is concentrated at the center of the atom. More than 99.9% of the mass of an atom is located in the nucleus. Additionally, the size of the atom is of the order of 10-10 m and that of the nucleus is of the order of 10-15 m.
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Following are the terms related to nucleus:
- Atomic Number
- Mass Number
- Nuclear Size
- Nuclear Density
- Atomic Mass Unit