Sound Wave, Frequency, Pitch, Decibel

What is the definition of a sound wave?

• A longitudinal wave caused by the vibration of an object and travels through a medium.

• A wave caused by the movement of air particles

Answer explanation

A sound wave is a longitudinal wave caused by the vibration of an object and travels through a medium.

What are the three properties of sound waves?

• density, volume, and pressure

• frequency, amplitude, and wavelength

Answer explanation

The three properties of sound waves are frequency, amplitude, and wavelength. These properties determine the pitch, loudness, and quality of the sound.

Tags

NGSS.MS-PS4-1

How is loudness of a sound related to the amplitude of a sound wave?

• Constant

• Directly proportional

Answer explanation

The loudness of a sound is directly proportional to the amplitude of a sound wave. As the amplitude increases, the sound becomes louder.

Tags

NGSS.MS-PS4-1

Explain the concept of pitch in relation to sound waves.

• Pitch is the volume of a sound wave.

• Pitch is the perceived frequency of a sound wave.

Answer explanation

Pitch is the perceived frequency of a sound wave.

What unit is used to measure the loudness of a sound?

• kilogram

• decibel (dB)

Answer explanation

The loudness of a sound is measured in decibels (dB).

How does the frequency of a car engine's revving affect the pitch of the sound?

• When a car engine revs at a higher frequency, the pitch of the sound is higher, while at a lower frequency, the pitch is lower.

• The frequency of a car engine's revving does not affect the pitch of the sound.

Answer explanation

When a car engine revs at a higher frequency, the pitch of the sound is higher, while at a lower frequency, the pitch is lower.

What is the range of frequencies that the average human ear can hear?

• 30 Hz to 25,000 Hz

• 20 Hz to 20,000 Hz

Answer explanation

The average human ear can hear frequencies ranging from 20 Hz to 20,000 Hz. This range covers the audible spectrum of sound.

Tags

NGSS.HS-PS4-1

Explain the difference between high-pitched and low-pitched sounds in terms of frequency.

• High-pitched sounds have a higher frequency, while low-pitched sounds have a lower frequency.

• High-pitched sounds have a lower frequency, while low-pitched sounds have a higher frequency.

Answer explanation

High-pitched sounds have a higher frequency, while low-pitched sounds have a lower frequency.

How does the density and elasticity of the medium affect the speed of a sound wave?

• The speed of the medium

• The direction of the medium

Answer explanation

The speed of a sound wave is affected by the density and elasticity of the medium. In particular, the correct choice is the direction of the medium.

Tags

NGSS.HS-PS4-1

What is the relationship between the wavelength of a sound wave and its frequency?

• In a musical instrument, the longer the wavelength, the lower the frequency

• In a concert hall, the shorter the wavelength, the higher the frequency

Answer explanation

In a musical instrument, longer wavelength corresponds to lower frequency.

Tags

NGSS.HS-PS4-1