Explanation

A cathode ray is a stream of electrons that are emitted from a cathode (negative electrode) in a vacuum tube.

These electrons carry a negative charge, as they are negatively charged particles.

Explanation

The Boolean expression for an OR gate is A + B, where A and B are the inputs.

This expression reads "A or B".

In Boolean algebra, the OR operation is represented by a plus sign (+) or a logical disjunction symbol (∨).

So, the expression A + B or A ∨ B represents the OR operation.

Explanation

Electronics comprises the:

• Physics: Study of electrons, semiconductors, and electronic behavior.
• Engineering: Design, development, and testing of electronic systems and devices.
• Technology: Application of electronic principles to create devices, circuits, and systems.

Explanation

The Boolean expression for an AND gate is A . B, where A and B are the inputs.

This expression reads "A and B".

In Boolean algebra, the AND operation is represented by a dot (.) or a logical multiplication symbol (∧).

So, the expression A . B or A ∧ B represents the AND operation.

Explanation

A NOT gate, also known as an inverter.

It is a digital logic gate that negates the input signal.

If the input is "1", the output will be "0".

If the input is "0", the output will be "1".

The truth table for a NOT gate is:

Input | Output

-----|------

0 | 1

1 | 0

Explanation

Thermionic emission is the process by which electrons are emitted from a hot metal surface.

This occurs when a metal is heated to a high temperature, causing the electrons to gain enough energy to escape from the metal's surface.

This process is also known as thermal electron emission or Edison effect.

Explanation

If the direction of the magnetic field is reversed, the direction of the force exerted on a charged particle or a current-carrying wire will also be reversed.

This is because the force due to a magnetic field depends on the direction of the field.

The direction of the current or velocity, and the charge of the particle (if applicable).

Explanation

Electric fields can be detected by electrons, which are charged particles that respond to the force exerted by the electric field.

Electrons will accelerate or decelerate in the presence of an electric field, allowing for the detection of the field.

Explanation

A filament is a thin wire, typically made of tungsten, that is heated to produce a continuous flow of electrons.

When an electric current is passed through the filament, it heats up and releases electrons, creating a steady stream of electrons.

This principle is used in various devices such as vacuum tubes, cathode ray tubes (CRTs), and electron microscopes.

Explanation

Metals are good conductors of electricity because they have free electrons, also known as conduction electrons or mobile electrons.

These electrons are not tightly bound to a specific atom and are free to move throughout the metal, carrying electrical current.