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Science Ch 9
| Question | Answer |
|---|---|
| sound waves | -these are mechanical waves -move the slowest through -they travel in all directions away from the source of the sound -get softer as their energy is used up |
| frequency | -the number of sound waves that pass a point in one second -related to the pitch of a sound |
| vibration | -a rapid, back-and-forth movement -too many large, loud vibrations can damage the human ear and cause ear pain |
| sound | -a vibration that can be heard -moves through matter in waves-the ones we hear are a blend of several waves |
| wave | a disturbance that moves energy from place to place |
| air | what most of the sounds we hear travel through |
| gasses, liquids, solids | what sound waves travel through |
| low pitch | a slowly vibrating object |
| decibels | measurement of the intensity of a sound |
| timbre | -why instruments sound different even when played at the same pitch and volume-the quality of a sound that distinguishes it from other sounds |
| volume | the loudness or softness of a sound |
| intensity | as intensity increases, the volume increases |
| echolocation | the ability that some animals have to "see" with sound |
| sonar | -used by scientists to help them locate things underwater-type of echolocation that locates things underwater |
| an ultrasound | -used by doctors to help them see inside a person's body without doing surgery -echoes of high-frequency sound waves to "see" inside a human body |
| materials that absorb sounds | rough, soft, or fuzzy |
| smooth walls | more likely to produce an echo |
| echo | a sound wave that bounces back toward its source and is heard again |
| acoustics | the science of sound |
| music | helps people developed theories about sound |
| smooth hard surfaces | reflect sound waves |
| noise | a harsh, unwanted, or unexpected sound |
| pitch | how high or low a sound is |
| a compression | the part of the sound wave where the motion of each vibration pushes together some of the particles of matter |
| oscilloscope | machine that changes sound waves into electrical pictures seen on a graph |
| high pitch | objects vibrate quickly |
| mechanical wave | sound waves that travel through matter |
| larynx | when we sing or speak it causes a vibration of the vocal cords in the _________ |
| gas | sounds move slowest through _______ |
| rarefaction, wavelength, compression | you will need to be able to label a diagram |
| How has God designed sound waves so that a person is able to hear all the different instruments in a musical piece at the same time? | God designed sound waves to be able to occupy the same space without disturbing one another. |
Created by:
tjahn
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