1. Physics of Waves What is sound? 1

2. Physics of Sound I. Basics of sound Terms and word wall II. What is a wave? III. Ultrasound 2

3. Sound word wall Wave Crest Trough Amplitude Frequency Hertz Pitch Doppler effect Noise 3

4. What is a wave? http://www.fearofphysics.com/Sound/dist.html 4

5. What is a wave? 1.The wavelength of the wave in the diagram above is given by letter ______. 2. The amplitude of the wave in the diagram above is given by letter _____. 5

6. What is a wave? 3. Indicate the interval that represents one full wavelength. http://www.fearofphysics.com/Sound/dist.html 6

7. Waves What is sound? – Pitch – Frequency – Noise What is noise? – How do noise differ from sound? 7

8. Ultrasound 8

9. 9

10. 10 Ultrasound imaging: imaging the heart heart valves atrium ventricle

11. Ultrasound 11 Ultrasound imaging: carotid artery

12. Ultrasound 12 Ultrasound imaging: carotid artery

13. Ultrasound 13 Ultrasound imaging: carotid artery

14. Speed = Wavelength Frequency Using the symbols v,, and f, the equation can be rewritten as v = f 14