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7L Sound
Key words
| Term | Definition |
|---|---|
| Amplitude | The height of the wave from the starting point to the crest (or trough) |
| Wave height | The total height from the crest to the trough |
| Frequency | The number of waves per second |
| Hertz | The unit for frequency (Hz) |
| Intensity | Loudness or volume of a sound |
| Pitch | How high or low a note sounds |
| Vibrate | Move backwards and forwards. Creates waves. |
| Vocal folds | Flaps of skin in the throat that vibrate to make sound |
| Medium | Any substance through which something travels |
| Particles | The tiny pieces that everything is made out of |
| Pressure wave | Waves like sound waves where the vibration of particles transfers energy |
| Sound wave | Vibrating particles that transfer energy and are detected by our ears |
| Vacuum | A space with no particles |
| Density | A measure of a substance’s mass per unit volume |
| Oscilloscope | An instrument that shows a compression sound wave as a visual transverse wave |
| Compression wave | Wave that vibrates back and forth along the direction of energy transfer |
| Transverse wave | Wave that vibrates up and down along the direction of energy transfer |
| Trace | Line that the oscilloscope makes |
| Absorb | Take in |
| Amplify | Make bigger |
| Auditory nerve | He nerve that carries impulse from an ear to the brain |
| Auditory range | The range of frequencies that an animal can hear |
| Cochlea | The part of the ear that changes vibrations into electrical impulses |
| Decibel | Unit for measuring loudness of sound (dB) |
| Diaphragm (physics) | A thin sheet of flexible material |
| Ear canal | The tube that leads to the ear drum |
| Ear protection | Ear plugs or covers for the ears that stop loud sounds damaging the ears |
| Eardrum | A thin membrane inside the ear that vibrates when sound reaches it |
| Impulse | An electrical signal that travels in the nervous system |
| Infrasound | Sound waves less than 20Hz |
| Ultrasound | Sound waves above 20 000Hz |
| Microphone | An instrument that converts sound waves into electrical current or voltage |
| Sound intensity meter | An instrument that measures the loudness of sound |
| Communication | Transferring information |
| Echo | A reflected sound |
| Echolocation | Finding objects by emitting sounds and listening for echos |
| Physiotherapist | Someone who treats injuries or other physical problems with physical treatments |
| Reflect | To bounce off a surface rather than pass through or be absorbed |
| Sonar | A machine used in the sea that sends sound waves and listens for echos |
| Transmit | To pass through a substance |
| Longitudinal wave | See compression wave |
| Crest | The top of a wave |
| Trough | The bottom of a wave |
| Superposition | When two waves meet and their effects add up or cancel out |
Created by:
andrewweng0406
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