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Scott Foresman Physical Science Chapter 4 Lesson 3 How does sound travel
Terms in this set (24)
Light is a kind of energy
Sound is a kind of energy. You can NOT see it but you can hear and sometimes feel it
Sounds are made when
matter vibrates or moves quickly back and forth
to move quickly back and forth
Anything that takes up space is matter
Air is matter!
When playing instruments
each of the sounds is made when something makes matter vibrate
How can you hear sound?
sound waves moves out from an object. As the sound waves move through the air, they make the air vibrate
Sound waves are different for light waves. Sound waves are more like waves that move through a spring. When sound vibrations move through matter, they push the particles of matter closer together. As the sound vibrations pass, the particles move apart again
The wavelength of a sound wave is the distance from a point on one part of a wave to the same point on the next wave
the loudness or softness of a sound
Ways sound is different
By volume and pitch
What makes some sounds louder than others?
The larger the energy is to make the sound, the louder the sound. It takes little energy to whisper but it takes a lot of energy to hit a big drum
The highness or lowness of a sound
When air is blown into the instrument, the air vibrates slowly. Because the air vibrates slowly, the sound waves are very long. Sound waves with long wavelengths make a sound with a low pitch
When air is blown into the instrument, the air vibrates quickly. The sound wave are very short and therefore make a sound with a high pitch
Has both low and high pitch. Thick strings vibrate slowly and have a low pitch. Thin strings vibrate quickly and have a high pitch
is thought to be pleasant
Too much noise is harmful to your health
Noise can damage your ears, make people upset, affect the way people sleep or digest food
Evening listening to pleasant sounds can be harmful
Listening to loud music over a long period of time can damage you ears.
How sound travels through air
sound waves make the particles in the air vibrate. When the particles vibrate, they bump into other particles. The sound waves move from one particle of air to the next. (The air particles are far apart!). The sound waves move slowly from one particle of air to the next
How does sound travel through water
the sound waves make the particles in water vibrate. The sound waves move from one particle of water to the next. (The particles of water are closer than the particles of air). The particles of water bump into one another faster than the air particles do. SOUND waves move FASTER in WATER than they do in AIR
How sound travels through wood
Sound waves make the particles in the wood vibrate. (The particles in the wood are very close together - they are almost touching each other). The particles of wood bump into one another very quickly. The sound waves move quickly from one particle of wood to the next. Sound waves travel FASTER in a material such as WOOD than they do in AIR or Water
How does hitting a drum cause the drum to make a sound?
When a drum begins to vibrate, sound waves move out from the drum. As the sound waves move through the air, they make the air vibrate
When does an object make a sound with a high pitch?
When the air vibrates quickly, it creates a wavelength that is short. When sound waves have short wavelengths, they have a high pitch
Why does sound travel faster through wood than it does through water?
The particles of wood are close together, they almost touch each other. So when the sound waves vibrate and make the particles of wood vibrate, the particles bump into to each other quickly. Therefore the sound waves travel fast. The particles of water are not close together so when the sound waves vibrate the particles, they bump against each other, but it takes a long time because they are farther apart.
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