Mindmap

sound

laura williams Englisch

Inhalt der Mindmap

sound

the speed of sound is roughly 740 MPH
- in air its 330 M/S
sound is a logitudinal pressure which travel through elastic medias
frequencys
- quite sound, low frequency
- quite sound, high frequency
- loud sound, loud frequency
- loud sound, high frequency
echoes are a reflection of sound waves. harder surfaces reflect sound. E.G. a wall.
examples of using echoes
- to measure; distance between 2 walls
- to measure; depth of ocean
- radar to know how far a star/planet is
calculations
- speed = distance/time
- echoe time = distance/speed of sound
ultra sound
- used for...
  - cancer
  - check up on feotus
  - looking at heart problems
  - liver problems
  - braking down kidney stones
    - and other stone in body
  - measuring blood flow
- ultra sound in medicine
  - advantages
    - quick to use
    - doesn't require needles/injections
    - not expensive
  - disadvantages
    - not in much detail
    - can't pass through bones
    - can't be used in areas with gas
hearing through the ear
- middle ear bones
  - carrys vibrations from ear drum to cochlea
- auditory nerve
  - carrys impulses from cochlea to brain
- ear drum
  - vibrates when sound waves reach it
- semi-circular canals
  - three tubes containing a liquid which moves when your head moves
- cochlea
  - contains cells, which are sensitive to sound vibrations