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2. Wave - Rhythmic disturbance that carries energy through matter and space ALL WAVES CARRY ENERGY! Pulse – one wave that travels through a medium Continuous waves – waves that repeatedly move up and down 2

3. Most waves need something to travel on (or through) The substance through which a wave travels is a medium 3

4. Amplitude (A) maximum displacement of a particle from rest or equilibrium position. Measure in units of length Phase Phase related to the position and motion of the particles of the medium 4

5. Period (T) – time it takes for one wave to pass The unit of a period is the second (s) Frequency (f) – the number of waves that pass each second The unit of frequency is Hertz (Hz) 5

6. Velocity - the speed of the wave denoted by v and measured in units of dist/time v = d/t = /T = f The speed of a wave depends on the properties of the medium through which it is traveling.

7. Frequency = 1/ period f = 1/T 7

8. Frequency = # waves / time f = # waves / t 8

9. Velocity= frequency x wavelength v = f x λ or λ/T 9

10. Transverse waves – matter in the medium moves back and forth at right angles to the direction that the wave travels. 10

11. Crest – top of a wave Trough – bottom of a wave 11

12. Amplitude – ½ the height of a wave Relates to the amount of energy carried by the wave 12

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14. Wavelength – the length of one cycle of a wave Abbreviated by using the symbol, λ 14

15. Frequency – how many cycles (waves) are completed in a given time (usually 1 second) 15

16. Compressional waves – matter in the medium moves in the same direction that the wave travels. Example: Sound waves 16

17. 17 Compression – the area where the particles are more dense

18. 18 Rarefaction – The less dense area of the wave

19. 19 Wavelength – One complete cycle of a wave

20. both transverse & compressional; examples: water waves, seismic waves 20

21. Appear to be standing still Standing waves are caused by two waves continuously interfering with each other. 21

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