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.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false
D. If assertion is false but reason is true.

Answer

B

Explanation

(b) `beta-`particles are emitted with very high velocity (up to `0.99 c`). So, according to Einstein's theory of relatively, the mass of a `beta-`particle is much higher compared to is its 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, beta-`particle and electron both are similar particles.