Information Signals

a pattern of dots and dashes, each one making up a letter or number

• Morse code
• binary code
• pixels
• bits

How does a cell phone send a picture to another cell phone?

• It changes the picture into text.
• It sends the picture through sound waves.
• It downloads the picture into light waves.
• It codes the picture into digital information.

Digital devices use _____ to send and transmit information.

• binary code
• Morse code
• pixels
• bits

A remote control sends signals to a television through:

• sound waves
• wires
• light waves
• binary code

What invention made it possible to communicate across long distances with electricity and Morse code?

• telephone
• telegraph
• television
• email

Cell phones convert sound waves into ____, which are sent from tower to tower.

• light waves
• sound waves
• radio waves
• Morse code

The telegraph became less useful when what was invented?

• telephone
• binary code
• computer
• email

What is the difference between analogue and digital data?

• Analogue is continuous data, whereas digital signals have two values, 0 and 1.
• Analogue has two values 0 and 1, whereas digital is continuous data.

I am the height of the wave. What am I?

• Amplitude

• Frequency

• Phase shift

• PCM

What is a method for turning analogue signals into digital?

• Defragging

• Pulse Code Modulation

• DAC

• Levelling