Cathode ray

The video explains the function of vacuum tubes, focusing on the emission of electrons from a heated metal coil and their acceleration by high voltage. It highlights the historical significance of cathode ray tubes in televisions and computer screens before the advent of flat panel technology.

What is the primary function of the negative terminal in a vacuum tube?

• To produce sound

• To generate heat

• To release electrons

• To emit light

In the classic design of a vacuum tube, what is the role of the heated metal coil?

• To absorb electrons

• To cool down the tube

• To emit electrons

• To create a magnetic field

How are electrons accelerated in a vacuum tube?

• By a mechanical force

• By a chemical reaction

• By a magnetic field

• By a high voltage

Before flat panel technology, where were cathode ray tubes commonly used?

• In solar panels

• In digital cameras

• In televisions and computer screens

• In mobile phones

What technological advancement reduced the use of cathode ray tubes?

• The creation of touch screens

• The development of flat panel technology

• The introduction of wireless technology

• The invention of LED lights