7th grade Science

It determines the s loudness or volume of a sound wave.

• frequency

• amplitude

Answer explanation

Amplitude determines the loudness or volume of a sound wave. Higher amplitude means a louder sound, while lower amplitude results in a quieter sound. Therefore, the correct answer is amplitude.

Tags

NGSS.MS-PS4-1

A _____ frequency sound has a higher pitch. A lower frequency sound has a _____ pitch.

• higher, higher

• lower, higher

• higher, lower

• lower, lower

Answer explanation

A higher frequency sound corresponds to a higher pitch, while a lower frequency sound results in a lower pitch. Therefore, the correct answer is 'higher, lower'.

It is the unit used for frequency.

• Hertz (Hz)

• decibel (dB)

Answer explanation

The unit used for frequency is Hertz (Hz), which measures cycles per second. Decibel (dB) is a unit for sound intensity, not frequency. Therefore, Hertz (Hz) is the correct answer.

Do sound waves travel through a medium?

• YES

• NO

Answer explanation

Yes, sound waves require a medium (like air, water, or solids) to travel. They propagate through the vibration of particles in these media, making 'YES' the correct answer.

Tags

NGSS.MS-PS4-2

Sound is a form of energy. How is it produced?

• by waiting

• by vibrating objects

Answer explanation

Sound is produced by vibrating objects, which create pressure waves in the air. These vibrations are what we perceive as sound. Waiting does not generate sound, making 'by vibrating objects' the correct choice.

Tags

NGSS.MS-PS4-1

A high amplitude sound means _____ sound, and a low amplitude sound means _____ sound.

• softer, louder

• louder, softer

• louder, louder

• softer, softer

Answer explanation

A high amplitude sound is perceived as louder, while a low amplitude sound is perceived as softer. Therefore, the correct choice is 'louder, softer'.

Tags

NGSS.MS-PS4-1

Sound Waves

• are Longitudinal waves.

• are Surface Waves.

• are Transverse Waves

• move in a circular motion.

Answer explanation

Sound waves are classified as longitudinal waves because the particles of the medium move parallel to the direction of the wave propagation, creating compressions and rarefactions.

The distance between the highest crest and the resting position of a wave marks the

• frequency.

• loudness.

• pitch.

• amplitude.

Answer explanation

The distance between the highest crest of a wave and its resting position is called the amplitude. It measures the wave's height and is a key factor in determining the wave's energy.

Tags

NGSS.MS-PS4-1

The distance a wave travels before it start to repeat is the

• frequency.

• wavelength.

• pitch.

• amplitude.

Answer explanation

The distance a wave travels before it starts to repeat is known as the wavelength. It is the length of one complete wave cycle, distinguishing it from frequency, pitch, and amplitude.

The number of times a wave repeats in a given amount of time is the

• frequency.

• wavelength.

• pitch.

• amplitude.

Answer explanation

The number of times a wave repeats in a given amount of time is defined as frequency. It measures how often the wave cycles occur, making 'frequency' the correct choice among the options provided.