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McCormack - Waves
McCormack- Waves
| Question | Answer |
|---|---|
| Wave | A vibration that transfers energy |
| Crest | Top of a Transverse wave |
| Trough | The bottom of a Transverse wave |
| Wavelength | Length of a wave from crest to crest ex. meters, nanometers |
| Waveheight | Heigth of a wave from crest to trough |
| Amplitude | Energy of a wave from line of rest to the crest or to the trough (voltage, volume) |
| Frequency | The number of waves per second (Hertz) freq. = speed/wavelength |
| Longitudinal Wave | Waves that vibrate forward & backward (parallel)to the direction of travel |
| Transverse Wave | Waves that vibrate up & down or left & right (perpendicular) to the direction of travel. |
| Mechanical Wave | Waves that require a medium ex. Sound, seismic, ocean waves |
| Electromagnetic Waves | Waves that do not require a medium ex. Radio, light, x-rays |
| Surface Waves | A combination of longitudinal & transverse waves that roll in a circular motion. |
| Medium | Solid, liquid, gas |
| Refraction | Light waves slow down and bend ex. white light to ROYGBIV |
| Reflection | Bouncing of light or sound waves off a surface |
| Diffraction | Waves move through an opening and spread out |
| Absorption | Light waves that soak into a surface & are not reflected |
| Compression | The crest of a longitudinal wave |
| Rarefaction | The trough of a longitudinal wave |
| Internal Reflection | Light waves that reflect inside a medium like an optical fiber |
| Hertz (Hz) | The units for Frequency, # cycles /second |
| Constructive Interference | Waves that are in phase with each other & add amplitude |
| Destructive Interference | Waves that are out of phase with each other & subtract amplitude |
| Convex lens | Lens that is thick in middle & thin on edge ex. telescopes & human eye |
| Concave lens | Lens that is thin in middle & thick on the edge ex. eye glasses |
| Density | Why does sound travel faster in solids than in liquids or gas? |
| 343 meters/sec | What is the Speed of sound in air at 20° C? |
| UV, X-rays, Gamma rays | EM waves that can be dangerous to humans |
| Radio waves | EM waves with the lowest frequency & longest wavelength |
| Infrared | Em waves that are given off by thermal energy |
| Ultraviolet | EM waves that are blocked by Ozone in the upper atmosphere |
| Law of Reflection | Angle of incidence = angle of reflection |
| Retina | Back of the eye that sees color and images |
| Lens | Part of the eye that focuses light to the retina |
| Wavelength(λ) = Speed/Frequency(ƒ) 142 m/s / 110 cyc/sec = 1.3 m | The speed of a wave is 142 m/s and the frequency is 110 Hz. What is the Wavelength |
| Doppler Effect | The pitch of a moving object increases then decreases as it passes a listener. |
| Why we see a Red rose | All other colors are absorbed by the rose except Red which is reflected. |
Created by:
fmccormack
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