Sound Waves

What is sound?

Vibrations: complete back-and-forth motion of an object

What are sound waves?

Sound Wave: longitudinal wave that is caused by vibrations and travels through a medium

How do sound waves travel?

• all directions away from its sorce

• Though A Medium- solid (fastest, closest together particles, liquid, gas (slowest, farthest apart particles)

• disturbs particles in a medium, causing them to vibrate

What is pitch?

How high or low, you think a sound is depending on frequency and wavelength of a sound wave

What determines pitch?

• frequency and wavelength

• The higher, the frequency, the shorter the wavelength -v.v-

Loudness

Measure of how well a sound can be heard

What makes a sound loud?

• Amplitude: Measure of how much energy a wave carries. Max distance that the particles vibrate from rest.

• Greater amp. = louder sound

How is loudness measured?

• intensity of wavelength

• Decibel: unit used for loudness

Doppler Effect

change in the observed frequency of a wave when the sound source, the observer, or both are moving

how do sound waves interact with each other?

matter can reflect sound waves

• Sound interactions:

• Reflection For sound = Echo

• Diffraction: bending of waves around a barrier

What is a resonance?

happens when a sound matches the natural frequency of an object and causes it to vibrate