Karteikarten
Waves Equations and Definitions
Karten in diesem Stapel (15)
- 1WavesWaves are vibrations that transfer energy from place to place without matter being transferred.
- 2Wave EquationWave Speed/Velocity = Frequency x Wavelength
C (m/s) = f (Hz) x λ (m) - 3Transverse and Longitudinal WavesTransverse Waves;
z.B. Light, vibrations perpendicular to the direction of energy transfer (up and down)
Longitudinal Waves;
z.B. Sound, vibrations parallel to direction of energy transfer (side to side) - 4Compression, Crests, Troughs & RarefactionCompression; areas in which air particles close together
Rarefaction; air particles far apart
Crests; top of wave
Troughs; bottom of waves - 5Example Question; Calculate velocity of a wave with frequency 10kHz and wavelength of 2mVelocity = frequency x wavelength
= 10kHz x 2m
= 20,000m/s
= 20km/s - 6Electromagnetic SpectrumGood/Gamma
Xylophones/ X Ray
Use/Ultraviolet
Lyrics/Light
In/Infrared
Music/Microwave
Repetitiously/Radiowave - 7Electromagnetic WavesTransverse waves transferring energy through space.
Travel slower through media other than vacuums.
Can reflect, refract and diffract. - 8ReflectionAngle of Incidence=Angle of Reflection
The virtual image appears the same distance from the mirror as the object.
Cannot be projected onto a screen- rays of light do not actually intersect. - 9RefractionWhen a ray of light enters a denser material the ray bends towards the normal. When a ray enters a less dense material the ray bends away from the normal. The rays are called incident and emergent.
This is what causes a pencil to appear bent in water. - 10DiffractionWhen a wave hits the edge of a barrier, it spreads out around the edge. The longer the wavelength, the more they spread out. This happens through a gap, and the smaller the gap, the more the waves spread. If the gap size=wavelength approx., the spread is semi-circular.
- 11Optical FibreWorks as infrared and visible light can send signals in curved paths due to total internal reflection.
- 12Communications with Microwaves and RadiowavesMicrowaves; pass through ionosphere (electrically charged layer of atmosphere) and so can reach satellites. Only short wavelengths pass through ionosphere.
Radiowaves; reflect off of ionosphere so can travel long distances. - 13Doppler EffectIf an object emitting waves is coming towards you, the waves will be compressed and the wavelength will decrease while the frequency increases. The opposite is true if it is moving away from you.
- 14Red Shift/Doppler Effect with LightIf the moving object is emitting light waves, then the colour of the light will appear different. We observe this in the universe, where all other galaxies appear red- they are moving away from each other. this supports/was the origin of the Big Bang theory.
- 15Cosmic Microwave BackgroundDiscovered by accident in the 60s, the CMB is considered the remnant of an initial 'Bang'. The radiation will have cooled to longer wavelengths in the microwave region.
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- Beschreibung
- GCSE Physics Karteikarten am Waves Equations and Definitions, erstellt von Last-minute-crammer am 18/09/2014.
- Erstellt von
- Last-minute-crammer
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