Explain linear and angular momentum.

(N/A) Linear momentum: Linear momentum is defined as the product of mass $(m)$ and velocity $(v)$.
Linear momentum $= m \times v$
Angular momentum: Angular momentum is defined as the product of the moment of inertia $(I)$ and angular velocity $(\omega)$.
Angular momentum $= I \times \omega$
For an electron of mass $m_e$ revolving at a distance $r$ from the nucleus:
Since $I = m_e r^2$ and $\omega = \frac{v}{r}$,
Substituting these into the angular momentum equation:
Angular momentum $= (m_e r^2) \times (\frac{v}{r}) = m_e v r$.