1. MUSICAL ACOUSTICS WAVES Science of Sound, Chapter 3

2. WAVE PROPERTIES: Reflection Refraction Interference Diffraction Doppler Shift WHAT IS A WAVE? Waves are disturbances that transport energy and information through a medium (but the medium itself is not transported). Waves can be longitudinal (e.g. sound waves) or transverse (e.g. waves on a string or water waves). ttp://www.animations.physics.unsw.edu. au/ //www.avnimations.physics.unsw.edu.a u/

3. Traveling wave on a rope Reflection of a pulse: at a fixed end at a free end Mirror image of an impulsive wave approaching: A plane mirror (left) A corner mirror (right)

4. REFLECTION OF AN IMPULSIVE WAVE At a fixed end At a free end

5. SUPERPOSITION OF WAVE PULSES

6. INTEFERENCE OF TWO IDENTICAL WAVES ON A STRING At times t 1 and t 5 there is constructive interference; at time t 3 there is destructive interference. Note that at points marked N, the displacement is always zero; this represents a STANDING WAVE

7. REFLECTION OF PRESSURE (SOUND) PULSE

8. SPEED OF SOUND IN IDEAL GAS

9. OCEAN WAVES WHEN THE WAVE ENTERS SHALLOW WATER IT SLOWS DOWN AND ITS HEIGHT INCREASES

10. DOPPLER EFFECT

11. REFLECTION – WATER WAVES

12. REFLECTION – SOUND WAVES

13. REFRACTION

14. TWO MEDIUMS

15. REFRACTION THROUGH A PRISM ANGLE OF INCIDENCE

16. IMAGES FORMATION BY LENSES REFRACTION OF LIGHT BY WATER

17. REFLECTION

18. REFRACTION

19. INTERFERENCE OF WAVES FROM TWO IDENTICAL SOURCES

20. INTERFERENCE OF WATER WAVES

21. DIFFRACTION OF WATER WAVES BY A SLIT

22. DIFFRACTION

23. DIFFRACTION OF LIGHT BY A PIN

24. DIFFRACTION OF LIGHT BY A SCREW

25. DIFFRACTION OF LIGHT BY A RAZOR BLADE

26. DIFFRACTION BY A SINGLE SLIT

27. DIFFRACTION

28. DIFFRACTION OF WATER WAVES

29. DIFFRACTION OF LIGHT AND SOUND WAVES

31. SPECTRAL ENERGY DISTRIBUTION OF A WHITE LED

32. LED SPECTRAL RESPONSE CURVE