Sound

Sound

1. Amplitude

   •          _____          A        /          I         M     /               I       PL   /                    I     IT /                        I   UDE
   • Is how loud a sound is
   • The height of the waves
   • Measured in decibels
   • More energy used to make the sound, more energy the soundwaves will have therefore the sound will be louder

2. Frequency

   •          _____                                  /           I                      /      /                I                 /    /                    I             / /                         I_____/  I------------------------I     Wavelength                      
   • Is the pitch of a sound
   • Measured in Hertz (Hz)
   • A sound that can't be heard by human ear(too high or too low) = ultrasound
   • The more waves per second the higher the note = wavelength
   • Length of waves

3. Echoes

   • Bats use echoes to travel in dark places
   • The faster sound reaches them, the closer an object is
   • Boats use sonar(echoes) to find sunken shps
   • = when sound bounces off something

4. Hearing

   • Humans hear between 20-20000 Hz
   • Deteriorates with age
     • And with being exposed to loud noises all the time e.g. factory worker
   • Most animals better than humans
     • The beluga whale's hearing range is between 1000 and 123000 Hz.
     • Owl's hearing extremely good to catch prey in night
     • Dolphins use sound to find objects in water
   • People wear ear defenders

5. Travels 330m/s in air

6. Travels faster in solids(denser)

   • Travels faster in water than in air(denser)