Radio Communication

Order of EM Spectrum

Raging Martians Invaded Venus Using X-ray Guns
Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma

Match

Pre-check

• Modulation

• Digital signal

• Analog signal

• GPS

• transceiver

add the signal wave to the carrier wave

Signal that is only on or off

Signal that can vary smoothly

global positioning system

transmits and receives different signals

• add the signal wave to the carrier wave

• Signal that is only on or off

• Signal that can vary smoothly

• global positioning system

• transmits and receives different signals

Match

Post-check

• Modulation

• Digital signal

• Analog signal

• GPS

• transceiver

add the signal wave to the carrier wave

Signal that is only on or off

Signal that can vary smoothly

global positioning system

transmits and receives different signals

• add the signal wave to the carrier wave

• Signal that is only on or off

• Signal that can vary smoothly

• global positioning system

• transmits and receives different signals

Multiple Select

Communication systems require waves

• True

• False

Multiple Choice

It is far more difficult to make a perfect copy of an analog wave because...

• the exact value of any one piece of information is not clearly defined.

• most analog waves have wavelengths that are too long to reproduce in copies.

• analog waves travel at speeds too great for modern technologies to use.

• each individual piece of information is either a zero, a one, or a two.

Multiple Choice

Why do people see distant events before they hear them?

• Light travels faster than sound.

• Sound travels faster than light.

• Human eyes are more sensitive than human ears.

• Human brains can only process events in that order.

Multiple Choice

Both analog and digital waves can experience noise as they travel. Noise is any unwanted signal that distorts or reshapes the original wave. The diagram below illustrates how the resulting waves might appear. The example above suggests that...

• digital waves cannot have noise or other distortions removed from them.

• there is no clear advantage to transmitting digital waves over analog waves.

• analog waves do not experience as much noise as digital waves.

• noise is less of a problem for digital waves than for analog waves.

Multiple Choice

Which one uses radio waves?

• Notebook

• Television

• Pencil

• Floor

Multiple Choice

How do radio waves work?

• A radio works by converting a specific wavelength into vibrations, generating sound from the speakers.

• They work by going trough and playing sound

• They work by going into the cord and play sound

• Radio waves work by converting vibration to speakers

Multiple Choice

Radio waves have a shorter wavelength and higher frequency than infrared rays.

• True

• False

Multiple Choice

How do FM waves travel?

• As changes in the frequency of the wave
• As changes in the amplitude of the wave
• As changes in the wavelength of the wave
• As changes in the resonance of the wave

Multiple Choice

In TV broadcasts...

• pictures are encoded with frequency modulation.

• sounds are encoded withy amplitude modulation

• radio waves carry both sound and picture signals.

• All of the above

Multiple Choice

Radio waves have the longest wavelength and smallest frequencies.

• True

• False