3 Wave nature of lightAmplitude- The height of the wave.
4 Wave characteristics of light Frequency and wavelength are inversely relatedc = λνOrV=fλc or V= 3.0 x 108 m/sλ= wavelength (m)v or f= frequency (Hertz= Hz)
5 Types of WavesLongitudinal Wave (Compression)- Vibrates parallel (in the same direction) to the wave traveling.Ex: Sound WavesParticles bump into each otherCompression- Particles get closer together.Rarefaction- Particles becoming thinner or more spread out.The opposite of compressions.
6 Period- The time it takes for 1 full wave to pass. Transverse- Vibrate perpendicular (at right angles) to the wave traveling.Particles move up and down while wave moves left to right.Period- The time it takes for 1 full wave to pass.Period= 1 / FrequencyUnits: Seconds / Wave
7 Properties of Waves 1) Reflection: Hitting a barrier. RADAR- Send out EM waves and they bounce back.2) Refraction: Bending a wave when the medium through which it travels changes.Submarines use refraction in order not to be detected.
8 3) Diffraction- Spreading of waves Bending waves around obstacles and openings.Owls use this to communicate over long distances4) Interference- Reinforcement or canceling of waves.ConstructiveDestructive
9 Doppler EffectAn apparent shift in frequency for a sound wave produced by a moving source.Shift in frequency + wavelength of waves which results from a source moving with respect to the medium.Works for all types of waves including light.Red shift - Occurs when the source + observer are moving away from each other.Blue shift- Occurs when the source + observer are moving towards each other.
15 Seeing Color Retina- Made up of two types of cells that absorb light. Cones- Distinguish colors and detailed shapes; most effective in daytime vision.Rods- Sensitive to dim light; most effective in nighttime vision.Color Blindness- Results when one or more sets of cones do not function properly.