3. Sound
3.1 what is sounds
-describe how sound is produced by vibrating source
- describe how travel as longitudinal wave using the process compression and rare fraction.
3.2 Transmission of sound
- explain that sound need a medium for transmission and that speed of sound if sound differ in solid, liquids and gas.
3.3 Reflection of sound
-describe how the reflection sound wave produce an echo and how this may be used to measure distance
3.4 ultrasound
-define ultrasound and describe one use of ultrasound i.g. quality control and pregnantal scanning.
3.5 Pitch and loundness
-relate of a sound wave to its amplitude and pitch to its frequency.