1_ULTRASOUNDS

1_ULTRASOUNDS

1. Sound = (mechanical) vibrations

   • Humans hear sound between 20Hz - 20,000 Hz
   • Any sound above 20,000 Hz = ULTRASOUND

2. USES

   • Pre-natal scanning
     • Checking on baby development
     • Checking for severe disabilities
   • Cleaning delicate machines
     • The liquid particles vibrate at high frequencies which clean the dirt
   • Breaking down kidney stones into smaller pieces

3. When ultrasounds meet a boundary, they are partially reflected

   • (pre-natal scanning) ultrasound waves reflect off baby tissue in womb and back into transducer, producing an image
   • Time taken for reflected wave to reach transducer tells us how far away boundary is
     • The results are processed to produce an image

4. FORMULA ALERT

   • S = V x T
     • S = Distance
     • V = Speed
     • T = Time
     • SOMETIMES DIVIDED BY TWO

5. Non - ionising do not damage living cells

   • Also produce accurate image of ultrasound

6. ADVANTAGES