Tareas

SOUND WAVES
What do they look like?


How can you describe a sound wave?


You can see a picture of a sound wave on the screen of a device called an oscilloscope.


[pic]

Look at thediagram above. The compressions, in which particles are crowded together, appear as upward curves in the line. The rarefactions, in which particles are spread apart, appear as downward curves inthe line.

Three characteristics are used to describe a sound wave. These are wavelength, frequency, and amplitude.



Wavelength; this is the distance from the crest of one wave to the crestof the next.
Frequency; this is the number of waves that pass a point in each second.
Amplitude; this is the measure of the amount of energy in a sound wave.




|Pitch|[pic] |
| |[pic]|
|This is how high or low a sound seems. ||
|A bird makes a high pitch. A lion makes| |
|a low pitch.| |



|Sounds also are different in how loud |[pic] [pic]|
|and how soft they are. ||
|The more energy the sound wave has the| |
|louder the sound seems. The intensity |...