Which part is heated in vacuum tube to emit electrons?

Anode

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Cathode

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Some time anode and some time cathode

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None of these

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Solution

The correct option is B Cathode
The cathode is heated, so it will emit electrons. This is called thermionic emission.

Hence, option $(B)$ is the correct answer.

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Which part is heated in vacuum tube to emit electrons?

The correct option is B CathodeThe cathode is heated, so it will emit electrons. This is called thermionic emission. Hence, option (B) is the correct answer.

The correct option is B Cathode
The cathode is heated, so it will emit electrons. This is called thermionic emission.

Hence, option $(B)$ is the correct answer.