P1.19 Ultra sound

P1.19 Ultra sound

1. Animals

   • Animals such as bats and dolphins use ultrasound to communicate

2. Scans

   • Used to make images of the body.
   • They are safe so they are used to scan foetuses
   • some of the sound is reflected each time it meets a layer of tissue with a different density

3. Sonar

   • Sonar is used on ships to measure the depth of the water.
     • It's calculated by the time that it takes from sending it to detecting it. Then you divide it by 2 as it's done 2 trips.

4. It's sound with frequency above 20,000 Hz