Which one of the following devices makes use of the electrons to strike certain substances to produce fluorescence
Thermionic valve
Photoelectric cell
Cathode ray oscilloscope
Electron gun
(c)
The colour of the positive column in a gas discharge tube depends on
How mass of an electron can be obtained ?
Energy of electrons can be increased by allowing them
The ratio of momenta of an electron and an $\alpha – $particle which are accelerated from rest by a potential difference of $100 V$ is
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
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