Which one of the following devices makes use of the electrons to strike certain substances to produce fluorescence
Which one of the following devices makes use of the electrons to strike certain substances to produce fluorescence
- A
Thermionic valve
- B
Photoelectric cell
- C
Cathode ray oscilloscope
- D
Electron gun
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In a Thomson set-up for the determination of e/m, electrons accelerated by $2.5$ $kV$ enter the region of crossed electric and magnetic fields of strengths $3.6 \times {10^4}V{m^{ - 1}}$ and $1.2 \times {10^{ - 3}}T$ respectively and go through undeflected. The measured value of $e/m$ of the electron is equal to
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