Physics-Unit 4 sound

Wavelength

distance between repeating parts (crest to crest)

When you put the strings connected to the hangers in your ears, why does it sound different than if you just listened to it without the strings?

the sound is being transferred through a solid rather than open air

How does sound get from two spoons clanging together to my ear?

the sound waves travel through the air and into your ear drum

If someone hits a bell on the other side of the room, you hear it. Do the particles that reach you come from the bell side of the room or the area next to your ear? Why is that?

they come from right by your ear because they are traveling through the air and it is a

Be able to draw a sound wave through a liquid and a gas

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Be prepared to see a picture and describe what is moving in order to create sound

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Draw a picture of what sound looks like traveling through a gas

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How does changing the amplitude affect wavelength?

Amplitude does not affect wavelength. It also does not affect wave speed. Amplitude is the energy of the wave measured from the rest position to the top of the crest. A wave with more energy has a higher up crest/ higher amplitude.

Amplitude

Energy of the waves shown by the distance from the rest line

How can we tell which direction sound is coming from?

Our brain times how long it takes for the sound to get to each ear. The one that hears the noise fastest must be the one that is the closest.

Using the particle model, explain why sound travels faster through a solid

Sound is transferred by compressing particles. If you are compressing something you need partticles to bump into one another in order for the compression to be passed on. Since solid particles are already touching it is very fast for them to transfer a compression. Gas particles are far apart, they take a while to get to the next particle to bump into.

What does your eardrum do?

Sound is transferred using the inner ear. The eardrum vibrates bones, that send waves into a shell-shaped structure. In the shell shaped structure (the cochlea) there are little hairs that are moved back and forth. This is how the information is gathered then sent tot he brain. The hair vibrations are transferred as a nerve impulse to the brain. The brain interprets that sound as high or low pitch.

How are frequency, wavelength, and wave speed related?

Wave speed = frequency x wavelength

What does a tuning fork do to the surface of water? Why is that?

it splatters it because the vibrations are strong enough to make it splash up

What kind of wave is sound?

longitudinal wave

What is being squeezed together as sound travels through air?

particles

Frequency

How many waves per second (measured hertz)

How does changing the frequency affect wavelength?

If the frequency increases, then the wavelength will be shorter, because there are more waves closer together.

If frequency is kept the same and the wavelength is shortened, what happens to the wave speed?

If the wavelength is shortened, then the crests are closer together meaning the wave will be speeding up.

Through what type of matter (solid, liquid, or gas) does sound travel through fastest?

solid

What is a medium?

what the sound is traveling through