Unit 3 Review

Front

What are digital signals?

Back

Digital signals are representations of data that use discrete values, typically represented as binary (0s and 1s). They are less affected by noise and interference compared to analog signals.

Front

What are analog signals?

Back

Analog signals are continuous signals that vary in amplitude or frequency and can take on any value within a given range. They are more susceptible to noise and interference.

Front

What is the speed of electromagnetic waves in a vacuum?

Back

The speed of electromagnetic waves in a vacuum is approximately 299,792 kilometers per second (or about 186,282 miles per second).

Front

What is the difference between electromagnetic waves and mechanical waves?

Back

Electromagnetic waves can travel through a vacuum, while mechanical waves require a medium (solid, liquid, or gas) to propagate.

Front

What are X-rays?

Back

X-rays are a form of electromagnetic radiation with frequencies higher than ultraviolet rays, used in medical imaging and other applications.

Front

What is wavelength?

Back

Wavelength is the distance between successive crests of a wave, typically measured in meters. It is inversely related to frequency.

Front

What is frequency?

Back

Frequency is the number of cycles of a wave that pass a point in one second, measured in hertz (Hz). Higher frequency means more cycles per second.

Front

What is amplitude?

Back

Amplitude is the maximum extent of a wave's oscillation, measured from the rest position. It determines the energy and intensity of the wave.

Front

What is noise in signal transmission?

Back

Noise refers to unwanted disturbances or signals that interfere with the transmission and reception of data, affecting the clarity and reliability of the signal.

Front

What is a photon?

Back

A photon is a quantum of electromagnetic radiation, representing a particle of light with no mass and traveling at the speed of light.