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
${v_1} > {v_2} > {v_3} > {v_4}$
${v_1} < {v_2} < {v_3} < {v_4}$
${v_1} = {v_2} = {v_3} = {v_4}$
${v_1} < < {v_2} > {v_3} < {v_4}$
Which of the following is not the property of a cathode ray
Which of the following will have the least value of $\frac{q}{m}$
In Thomson spectrograph experiment, four positive ions $P,Q,R$ and $S$ are situated on $Y-X$ curve a shown in the figure
Which scientist invented cathode rays ?
In $1897$, J.J.Thomson invented which particle ?