Question

Vacuum is created in the vacuum tube -

• A. to avoid energy losses of electrons.
• B. to prevent vacuum tube from burning.
• C. to make flow of electrons unidirectional.
• D. to increase life of vacuum tube.

Answer 1

The correct option is A to avoid energy losses of electrons.

Vacuum is created because electrons can collide with air molecules and lose its energy.

Therefore, to avoid energy loses of electrons, vacuum is created.

​​​​​​​Hence, option $\left(A\right)$ is the correct answer.