Unit 8.2 Quiz 3

Which property of a wave affects loudness of sound?

• amplitude

• frequency

• period

• wavelength

Answer explanation

The amplitude of a wave determines its loudness; higher amplitude means louder sound. Frequency, period, and wavelength affect pitch, not loudness.

Tags

NGSS.MS-PS4-1

How is amplitude related to sound?

• As amplitude decreases, pitch decreases.

• As amplitude decreases, loudness increases.

• As amplitude increases, pitch increases.

• As amplitude increases, loudness increases.

Answer explanation

Amplitude refers to the height of sound waves. As amplitude increases, the energy of the sound wave increases, resulting in a louder sound. Therefore, the correct relationship is that as amplitude increases, loudness increases.

Tags

NGSS.MS-PS4-1

The top of a sound wave is called the:

• amplitude

• crest

• trough

• wavelength

Answer explanation

The top of a sound wave is called the crest. It represents the highest point of the wave, while the trough is the lowest point. Amplitude refers to the height of the wave, and wavelength is the distance between successive crests.

Tags

NGSS.MS-PS4-1

The bottom of a sound wave is called the:

• amplitude

• crest

• trough

• wavelength

Answer explanation

The bottom of a sound wave is referred to as the trough. It represents the lowest point in the wave, while the crest is the highest point. Amplitude measures the height of the wave, and wavelength is the distance between successive crests or troughs.

Tags

NGSS.MS-PS4-1

What does frequency represent in a wave?

• It is a vibration that extends from one place to another.

• It is how often a vibration (cycle) occurs.

• It is the distance from the midpoint to the crest or trough.

• It is the distance from one crest to the next.

Answer explanation

Frequency in a wave refers to how often a vibration or cycle occurs within a given time period. This distinguishes it from other wave properties like amplitude and wavelength.

The number of waves that pass a given point in one second:

• amplitude

• frequency

• period

• wavelength

Answer explanation

The frequency of a wave refers to the number of waves that pass a given point in one second. It is measured in hertz (Hz), making 'frequency' the correct answer, while amplitude, period, and wavelength refer to different wave properties.

Tags

NGSS.HS-PS4-1

The time it takes for a wave to complete one cycle:

• amplitude

• frequency

• period

• wavelength

Answer explanation

The period is the time it takes for a wave to complete one full cycle. It is distinct from amplitude, frequency, and wavelength, which describe other wave properties.

Tags

NGSS.HS-PS4-1

How are frequency and pitch related?

• there is no direct relationship

• higher frequency = higher pitch

• lower frequency = higher pitch

• higher frequency = lower pitch

Answer explanation

Frequency and pitch are directly related; higher frequencies correspond to higher pitches. This means that as the frequency of a sound wave increases, the perceived pitch also increases, making 'higher frequency = higher pitch' the correct choice.