Flashcards
sound
Cards in this deck (10)
- 1what are soundwavesvibrations that pass through the molecules of a medium
- 2what type of waves are sound wavesLongitudinal - travel as a series of compressions and rarefactions
- 3how does sound travel through solids- causes particles inside the solid to vibrate
- vibrating particles collide with their neighbours and pass on the vibrations
- happens over and over again and the sound wave gets emitted through the material - 4sound waves need particles to be transmittedthe more densely packed particles are, the faster the sound travels
(particles travels faster in solids than liquids) - 5why cant sound travel through a vacuumno particles for the sound to vibrate through
- 6what happens as soundwaves pass through different mediumstheir frequency doesn't change
(speed = frequency x wavelength)
if speed increases and frequency stays the same the wavelength must increase instead
^ wavelength gets longer as sound speeds up (happens in high density mediums - solids) and shorter shorter as sound waves slow down in materials like air - 7sounds can be refracted, reflected and absorbedhard, flat surfaces reflect the most- gives echoes
- 8how does human hearing work1. sound waves reach the ear and travel through the ear canal and hit the ear drum causing it to vibrate
2. vibration is transmitted along the tiny bones (ossicles) , through the semi circular nerves and into the cochlea
3. cochlea converts vibrations into electrical signals
3. Signals are sent along the auditory nerve and into the brain
4. brain interprets the signals as sounds (high frequency - high pitches ) , more intense signals (interpreted as being louder) - 9what does the sie and shape of the structures determinewhich frequencies you can hear
Humans can hear signals from 20hz - 20,000hz
As we get older, the range of our hearing decreases ( wear and tear of the cochlea and auditory nerve) - 10Not all frequencies can be transferred through an objectan object's size, shape, and structure determines which frequencies it can transmit
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- Physics Flashcards on sound, created by Ellaine Wahome on 23/10/2021.
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- Ellaine Wahome
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