In a parabola spectrograph, the velocities of four positive ions $P,Q,R$ and $S$ are $v_1$, $v_2$, $v_3$ and $v_4$ respectively
${v_1} > {v_2} > {v_3} > {v_4}$
${v_1} < {v_2} < {v_3} < {v_4}$
${v_1} = {v_2} = {v_3} = {v_4}$
${v_1} < < {v_2} > {v_3} < {v_4}$
An $\alpha$ particle is accelerated through a p.d of ${10^6}$ volt then $ K.E$ . of particle will be .......... $MeV$
If an electron oscillates at a frequency of $ 1 GHz$ it gives
The charge on electron was discovered by
$1$ $J$ is equal to how many electron volt?
The current conduction in a discharged tube is due to