2.  Have to go through a medium (air, water, rock)  The disturbance travels not the particles.

3.  Does not have to pass through a medium  Particles move up and down

4.  Crest- the highest point  Trough- the lowest point Rest position - the position of the wave before any disturbance

5.  the greatest distance that wave particles move from their rest position

6. Fig. 7.2

7.  the distance between one point in the wave to the nearest point just like it Transverse: › Crest to crest › Trough to trough Longitudinal: - Compression to Compression - Rarefaction to Rarefaction wavelength

9. –shorter wavelength  higher frequency  1 second

11.  Humans can hear 20Hz to 20KHz  Lose hearing of high pitches as you get older  Bass lower frequency and less energy

13. 1. Indicate the interval which represents one full wavelength. A. a to c B. b to d C. a to g D. c to g

24. Type of RadiationWavelengthDangerousDetected ByBlocked By RadioLongestNoRadio Receiver Viaducts, Power lines MicrowavesLongerNoHeated FoodWater Infrared (heat)LongNoThermometerClouds Light (ROY G BIV) MediumNoEyes Ultra VioletShortYesSkinOzone Layer X-RaysShorterYesFilmEarth’s Magnetic Field GammaShortestYesGeiger Counter Earth’s Magnetic Field

25. Three Series of Spectral Lines of Atomic Hydrogen Fig. 7.9

26. Emission and Absorption Spectra of Sodium Atoms Fig. 7.B