Waves in Action

What is a crest in a wave?

• The lowest point of a wave.

• The highest point of a wave.

• The speed of a wave.

• The distance between two waves.

What is an example of a low-frequency sound?

• A flute

• A drum or a bass guitar.

• A violin

• A trumpet

What happens to sound waves as they travel further from the source?

• They gain energy and become louder.

• They lose energy and become quieter.

• They change frequency and become higher-pitched.

• They travel faster and become more intense.

What is the loudness of a sound determined by?

• The frequency of the sound wave.

• The amplitude of the sound wave.

• The duration of the sound wave.

• The speed of the sound wave.

What is the Doppler effect?

• The change in frequency or pitch of a wave in relation to an observer moving relative to the wave source.

• The increase in amplitude of a wave as it approaches an observer.

• The reflection of waves off a surface causing a change in direction.

• The absorption of sound waves by a medium, reducing their intensity.

What is frequency in waves?

• The speed of a wave in a vacuum.

• The distance between two consecutive waves.

• The number of waves that pass a point in one second.

• The amplitude of a wave.

How does sound travel through different materials?

• Sound travels fastest through gases, slower in liquids, and slowest in solids.

• Sound travels at the same speed in all materials.

• Sound travels fastest through solids, slower in liquids, and slowest in gases.

• Sound travels fastest through liquids, slower in gases, and slowest in solids.

What is an echo?

• A type of sound wave that cannot be heard.

• A reflection of sound that arrives at the listener after a delay.

• A sound that is produced by a musical instrument.

• A phenomenon where sound is absorbed by materials.

What type of wave is sound?

• Transverse wave

• Longitudinal wave

• Surface wave

• Electromagnetic wave

What is amplitude?

• The distance from the middle point of a wave to a crest or a trough.

• The total height of a wave from crest to crest.

• The speed at which a wave travels through a medium.

• The frequency of a wave measured in hertz.