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Sound is the transfer of energy from a vibrating object through a medium
Sound is the transfer of energy from a vibrating object through a medium
Sound looks like a longitudinal/compression wave which means IT NEEDS A MEDIUM
Sound looks like a longitudinal/compression wave which means IT NEEDS A MEDIUM
So, if you are in space (which has no air) with someone can they hear you scream?
So, if you are in space (which has no air) with someone can they hear you scream?
When an object vibrates it pushes all the atoms near the object close together. This continues over and over again as long as their is enough energy.
When an object vibrates it pushes all the atoms near the object close together. This continues over and over again as long as their is enough energy.
Remember that sound is a longitudinal wave, so scientists can use special machines to allow them to more easily study waves
Remember that sound is a longitudinal wave, so scientists can use special machines to allow them to more easily study waves
Sound and other waves travel differently through different kinds of medium.
Sound and other waves travel differently through different kinds of medium.
There are two main things that affect how quickly waves travel through a medium:
There are two main things that affect how quickly waves travel through a medium:
1. states of matter
1. states of matter
2. temperature of matter
2. temperature of matter
Higher temperatures transfer waves much better than colder temperatures
Higher temperatures transfer waves much better than colder temperatures
Sound has various properties that are affected by increases/decreases in energy
Sound has various properties that are affected by increases/decreases in energy
Intensity is the amount of energy in the sound wave.
Intensity is the amount of energy in the sound wave.
We interpret intensity as volume, how loud or soft a sound sounds
We interpret intensity as volume, how loud or soft a sound sounds
If a sound wave has a high intensity, it has a loud volume
If a sound wave has a high intensity, it has a loud volume
Intensity/loudness is usually measured in decibels (dB)
Intensity/loudness is usually measured in decibels (dB)
According to audiologists and ENT (ear, nose, throat) doctors, sounds above 90 decibels may cause hearing damage
According to audiologists and ENT (ear, nose, throat) doctors, sounds above 90 decibels may cause hearing damage
Pitch is how high or low sounding the sound is
Pitch is how high or low sounding the sound is
Pitch is related to frequency
Pitch is related to frequency
The higher the pitch, the higher the frequency of the wave
The higher the pitch, the higher the frequency of the wave
Remember that frequency is measured in Hertz (Hz)
Remember that frequency is measured in Hertz (Hz)
Most humans can hear sounds between 20 Hz - 20,000 Hz
Most humans can hear sounds between 20 Hz - 20,000 Hz
Instruments can change the pitch of their sounds by adjusting their strings or length of the instruments
Instruments can change the pitch of their sounds by adjusting their strings or length of the instruments
Shorter strings produce higher pitch sounds, longer strings produce lower pitch sounds
Shorter strings produce higher pitch sounds, longer strings produce lower pitch sounds
Have you ever watched a firetruck drive down the road?
Have you ever watched a firetruck drive down the road?
Did you notice how it sounds different driving towards you versus away from you?
Did you notice how it sounds different driving towards you versus away from you?
The Doppler Effect is an audio phenomenon in which a change in the frequency of sound waves occurs when the source of the sound waves is moving relative to a stationary listener
The Doppler Effect is an audio phenomenon in which a change in the frequency of sound waves occurs when the source of the sound waves is moving relative to a stationary listener
In other words, as the object moves closer to you the sound waves get closer together making the wavelengths shorter and the frequency higher. As it moves away from you, the opposite happens.
In other words, as the object moves closer to you the sound waves get closer together making the wavelengths shorter and the frequency higher. As it moves away from you, the opposite happens.
Watch the video to learn more
Watch the video to learn more
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