Vocabulary
A push or a pull that acts on an object
Force
If a sound source vibrates slower, what happens to the pitch?
The pitch becomes lower.
Increasing the amplitude of a vibration makes the sound...
Louder
What do the air particles do as sound travels through them?
They vibrate back and forth in place, transferring energy to neighboring particles.
What part of your body is the sound receiver when you hear something?
The eardrum
Moving back and forth, or side to side, or up and down repeatedly, past its starting point
vibrate
What does a low frequency sound graph look like?
less peaks and valleys
big wavelength
What does a sound source do to the particles around it?
t causes the nearby particles to vibrate, initiating the particle-to-particle collision through the medium that makes sound travel.
Why can sound travel through air but not through empty space?
Sound needs matter. Particles to transfer the sound vibrations through collisions.
When sound reaches a receiver, what happens to it?
It will vibrate and deform past the starting point
Distance from the starting position to a peak or a valley
Amplitude
What determines a sounds pitch?
frequency (length of bars/strings)
Why does a vibrating object continue to vibrate even after you stop pushing on it?
The object will vibrate and deform past its starting point until their is no energy left
How do you know that no air particles left the ziploc bag in lesson 7 after a sound was played?
The mass stayed the same.
The density (chunk) of particle compression gets greater when the__________ of vibration at the sound source increases.
amplitude
The highness or lowness of a sound.
Pitch
On a motion graph of a vibrating object, how can you tell which sound is higher pitched?
Amount of peaks and valleys (frequency) and smaller wavelength
What happens to a sound source’s vibrations when the sound has a higher pitch
The sound source vibrates faster, or with a higher frequency
The distance between chunks of particles appears to change when we change the ________ of vibration changes.
frequency
Why do soft sounds do less damage to the ears than loud sounds?
Small force applied to the speaker
Vibrates less past the starting point because it has less energy
The vibrations cause the air particles in the medium to collide with each other and transfer little energy
Small chunk of air particles collide into the eardrum with less force and transfer less energy
What does sound need to travel through?
Two sounds have the same amplitude but different frequencies. How will they sound different?
One could be a high, medium or low pitch at the same amplitude.
Why can sound make another object move (like the window in the anchoring phenomenon)?
The sound source’s vibrations transfer energy through particle collisions in the medium, causing the sound receiver to vibrate and deform past its starting point.
Describe how sound travels from a sound source through a medium to a receiver
Vibrations from the source cause nearby particles in the medium to vibrate (depending on the amplitude); those particles collide with other particles, transferring the vibration and energy through the medium
Why did the quiet low pitch sounds do less damage to her ears than the quiet high pitch sounds?
Quiet low pitch sounds transfer less energy less frequently.
The air particles in the medium are a small chunk and collide with the eardrum less frequently with less energy moving it a little past the starting point.
3. This causes less damage to the ear drum.