Waves and Signals

The two waves have different...

• amplitudes

• speeds

• wavelengths

• frequencies

What is the bottom of a wave?

• trough
• crest

What is the letter a showing?

• crest

• trough

• wavelength

• amplitude

What is frequency measured in?

• Milliseconds

• Miles

• Hertz

• Kilograms

Erika visits the Grand Canyon with her family. When she shouts near the edge, she can hear her voice echo throughout the canyon. Which statement describes why she hears her echo?

• The sound was loud

• The sound waves travelled in a vacuum

• The sound waves reflected off the canyon walls

• The sound waves bent as they travelled into the canyon

The image provided is a _________ signal.

• Analog

• Digital

Sound waves do not require a medium to travel through

• True

• False

This signal is a continuous signal

• Analog

• Digital

What kind of wave is pictured?

• transverse

• longitudinal

• surface

• none of the above

What technology uses binary code of 0 and 1?

• Analog

• Digital

• Both

• Neither