science

science

1. soundwaves are collected by the ear canal

   • soundwaves are longitudinal waves- the vibrations are in the same direction as the direction of travel
     • the frequency of waves are measured in hertz what has the symbol Hz. the bigger the number the greater the frequency.
       • when two waves meet they affect eachother that is called superposition
         • mobile phones and telephones contain microphones these devices contain a diaphragm vibrate and the vibrations change into electrical impulses in the lab the electical impulses can be sent to an oscilloscope, which repersents them as a graph on a screen
   • if waves meet in step they will add together increasing the amplitude

2. ripples are waves traveling through the water. pebble in pond. waves move with a transverce motion .

   • amplitude is the height of a wave from its resting position the greater the amplitude the louder the sound
     • wavelength is the distance between the crests [tops] of two waves
   • frequency is the number of waves per second the higher the frequency the closer together the waves are and the higher the pitch

3. if waves meet out of step then they subtract, cancelling eachother out.

4. sound travels fastestin a solid. particles can pass energy on quickly because they are arranged in a regular pattern and are tightlypacked

   • humans can hear sounds as low as 20Hz and as high as 20,000Hz [20Hz]
   • soundwaves are produced by all vibrating objects loudspeakers work by converting electrical energy into kinetic energy this moves the cone which creates