Waves and Information

Waves move forward and backward.

• True

• False

Amplitude is...

• The distance from the middle point of a wave to the wavelength

• The distance from one crest to the next crest

• The distance from one trough to the next trough

• The distance between the middle point of a wave and a crest or trough.

What happens when waves move across the surface of deep water?

• The water moves forward.

• The water moves backward.

• The water does not move.

• The water moves up and down.

Look at the photo. It shows the waves that formed when a small rock was dropped into the water. The waves are not very tall nor far apart. Which of the following correctly describes the properties of these waves?

• Low amplitudes and short wavelengths

• High amplitudes and long wavelengths

• Low amplitude and long wavelengths

• High amplitudes and short wavelengths

When does water move in the direction of a wave?

• When boats move through the water

• When the water gets close to the beach

• When a surfer sits on a surfboard

• When waves move across the surface of deep water

1. Maddy’s science teacher asked the class to use pieces of string to make some model waves. Maddy measured the waves she made. Her measurements are in the data table below. If the models were real waves, which wave peaks would have the greatest height?

• Wave 1

• Wave 2

• Wave 3

• Wave 4

1. Which part of this drawing is a wave trough?

• A

• B

• C

• D

What does it mean if waves have short wavelengths?

• The distance from one crest to the next trough is large.

• The distance from one trough to the next is small.

• The distance from one trough to the next is large.

• The distance from the middle point of a wave to a trough is small.

Which of these waves would transfer the most energy?

• One with a high amplitude

• One with a low crest

• One with a high trough

• One with a low amplitude

Which of these is an example of transmitting information with digital code?

• Using Morse code

• Talking to someone in the same room

• Sending a letter through the mail

• Sending a text on a cell phone