Sound and pitch for a test

What is sound?

Sound is a vibration that travels through air, water, or solids as a wave.

Define pitch.

Pitch is how high or low a sound is perceived, determined by the frequency of sound waves.

True or false: Sound travels faster in air than in water.

False, because sound travels faster in water due to higher density.

Difference between frequency and wavelength.

Frequency is the number of waves per second, while wavelength is the distance between consecutive peaks.

Fill in the blank: The unit for frequency is ___ .

Hertz (Hz)

What affects the pitch of a sound?

The pitch is affected by frequency; higher frequencies result in higher pitches.

Describe sound waves.

Sound waves are longitudinal waves consisting of compressions and rarefactions.

What is the speed of sound at 20°C?

Approximately 343 meters per second (1,125 feet per second) in air.

True or false: Amplitude affects the loudness of sound.

True, because higher amplitude results in louder sounds.

What is a decibel?

A decibel (dB) is a unit measuring the intensity of sound.

Difference between ultrasonic and infrasonic.

Ultrasonic sounds are above 20 kHz, while infrasonic sounds are below 20 Hz.

What is resonance?

Resonance is when an object vibrates at its natural frequency, amplifying sound.

Fill in the blank: The human hearing range is ___ Hz.

20 Hz to 20,000 Hz

Question: How do musical instruments create sound?

They create sound by vibrating a medium, such as strings or air columns.

What influences the timbre of a sound?

The timbre is influenced by the sound's harmonics and overtones.

True or false: Sound can travel through a vacuum.

False, because sound requires a medium to travel.

What is the relationship between frequency and pitch?

Higher frequency corresponds to a higher pitch, while lower frequency corresponds to a lower pitch.

Fill in the blank: The Doppler effect explains changes in ___ .

frequency due to the relative motion of the source and observer.