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sound waves 2
| Question | Answer |
|---|---|
| pitch | how high or low a sound is |
| volume | how loud or soft a sound is |
| decibels | A unit to measure the intensity or loudness of sound |
| timbre | quality of a sound that distinguishes it from other sounds of the same pitch and volume |
| echolocation | the ability to see with sound |
| sonar | a type of echolocation developed by man that can locate items underwater |
| ultrasound | a technology that uses echoes to make images or pictures; it is used by doctors to "see" inside the body |
| acoustics | quality that makes a room easy or hard to hear in |
| Infrasonic | Term applied to sound pitch too low to be heard by the human ear, that is, below 20 hertz. |
| ultrasonic | Describes a sound of a frequency too high to be heard by the normal human ear---above 20,000 hertz |
| air is a ____ conductor of sound relative to solids and liquids | poor |
| sound wont travel in a _____ because there is no material to vibrate and carry the sound | vacuum |
| Distinguish between a compression and a rarefaction. | In a compression, the molecules are closer together than average; in a rarefaction, they are further apart. |
| What factors does the speed of sound depend upon? What are some factors that it does not depend upon? | It depends on temperature and humidity, not on loudness and frequency |
| What is the speed of sound in dry air at 20°C? | 340 m/s |
| Does sound travel faster in warm air or in cold air? In humid air or dry air? | Faster in warm air, faster in humid air |
| How does the speed of sound compare to the speed of light? | The speed of sound is a million times less than the speed of light. |
| What ultimately happens to the energy of sound in the air? | It becomes thermal energy. |
| The pitch of sound is most closely related to _________. | frequency |
| Reverberation | repeated echoes of sound |
| Sound travels from one place to another mainly in a series of _________. | compressions and rarefactions |
| the speed of sound on a warm day is ______ versus on a cold day? | faster |
| What is the cause of refraction? | Different speeds of sound in a medium |
| What is ultrasound? | Sound above the frequency of human hearing |
| The speed of sound in air varies with _________. | air temperature |
| A reverberation occurs when sound undergoes _________. | multiple echoes |
| Refraction of sound occurs with changes in wave _________. | speed |
| How does a radio wave differ from a sound wave? | A radio wave is an electromagnetic wave that travels at the speed of light, whereas a sound wave travels at the speed of sound through air or another elastic medium. |
Created by:
rufus webster