The ratio of momenta of an electron and an $\alpha - $particle which are accelerated from rest by a potential difference of $100 V$ is
$1$
$\sqrt {\frac{{2{m_e}}}{{{m_\alpha }}}} $
$\sqrt {\frac{{{m_e}}}{{{m_\alpha }}}} $
$\sqrt {\frac{{{m_e}}}{{2{m_\alpha }}}} $
When electron beam passes through an electric field, they gain kinetic energy. If the same beam passes through magnetic field, then
When cathode rays (tube voltage $~ 10 kV$) collide with the anode of high atomic weight then we get
What is specific charge ? Write its standard value.
The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by
Cathode rays are similar to visible light rays in that