Static Characteristics of a Triode

Why the vacuum diode does not work under reverse bias condition?

The $\mathrm{V}-\mathrm{I}$ characteristic of vacuum diode as shown below:

You have to identify the regions which marked as $\text{'}\mathrm{a}\text{'}$ and $\text{'}\mathrm{b}\text{'}$.

The same vacuum diode will have _____ $\mathrm{V}-\mathrm{I}$ characteristic graphs at different cathode temperatures.

In which principle the vacuum diode works?

When triode is used as an amplifier, the phase difference between input voltage and output voltage is

What is the direction of electron flow in a vacuum tube triode?

How does a triode amplify?

Who implemented vacuum triode?

How does a triode vacuum tube work?

What are characteristics of vacuum tube?

What is a vacuum tube radio?

What are the characteristics of triode?

Cotyledons are also called-