Longitudinal Waves (P4)

Frequency - how many compressions/rarefractions in 1 second

Amplitude - distance between compresseion and rarefraction

Ultrasound:

• Sounds with frequency greater than 20,000 Hz

Uses of Ultrasound:

• Body scan - development of the foetus

Ultrasound waves are beamed into the body from a special transmitter. These waves reflect from different layers inside the body returning to the reciever at different times. A computer processes this information…