Q1 of 49 Page 351

Cathode rays constitute a stream of

Cathode is responsible for thermionic emission and thermionic emission is due to electrons which leave its surface. Therefore, rays should constitute a stream of electrons.


Ions are present due to gases but they do not account for rays from cathode surface as only electrons are the one leaving the surface.

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9

The cathode of a diode valve is replaced by another cathode of double the surface area. Keeping the voltage and temperature conditions the same, will the plate current decrease, increase or remain the same?

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Why is the linear portion of the triode characteristic chosen to operate the triode as an amplifier?

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Cathode rays are passing through a discharge tube, in tube, there is

 3

Let i0 be the thermionic current from a metal surface when the absolute temperature of the surface is T0. The temperature is slowly increased and the thermionic current is measured as a function of temperature. Which of the following plots may represent the variation in (i/i0) against (T/T0)?