Karteikarten
Light and waves: wavelength, frequency, mirrors and lenses
Karten in diesem Stapel (27)
- 1Light wavesTravels on transverse waves and carries energy. As it has energy, light can move and travels in straight lines. Luminous objects produce light and non-luminous objects do not produce light and can only be seen if they are light reflected. Light does not need mediums to travel through but they can travel through mediums.
- 2Wave Lengththe distance between 2 consecutive similar points on a wave. (i.e. crest to crest)
- 3Frequencythe amount of waves passing a fixed point per second. (measured in Hertz, a.k.a. Hz) The formula for frequency is: F = number of waves passed ÷ Time (seconds)
- 4Amplitudethe distance from the midpoint of a wave to the high or low point.
- 5Crestthe high point of a wave.
- 6Troughthe low point of a wave.
- 7Periodthe time taken for a wavelength to pass a certain point.
- 8Pitchhow low or high a sound is.
- 9Sound WavesThe larger the amplitude, the louder the sound. The greater the frequency, the higher the pitch. They are mechanical and travel through materials known as mediums.
- 10Electromagnetic RadiationWhile long waves have low energy, short waves have higher energy. They travel in waves and can be reflected or changed into heat energy. When radiation is reflected, the substance that it is reflected on becomes shiny. Radiation may be absorbed and the substance will increase in temperature.
- 11Electromagnetic SpectrumThe spectrum of radiation is known as the electromagnetic spectrum. The waves are identified by their frequency and wavelength. This radiation spreads out from its source and travels in straight lines.
- 12Conductionis when energy transfers through a solid. When energy travels quickly through a substance, it is a good conductor. A poor conductor of heat energy is known as an insulator.
- 13ConvectionHeat energy can also cause the particles in air or fluids to gain energy and displace particles. This process is known as convection, which only occurs when gravity is present. The heated substance become less dense.
- 14Velocitythe speed in which waves travel (measured m/s)
- 15Incident RayThe ray of light that strikes the surface before reflection, transmission and absorption.
- 16Reflected RayThe reflected version of the incident ray. It is reflected from the surface.
- 17Angle of incidenceThe angle which an incident line/ray is reflected back after hitting the surface of an object.
- 18Angle of reflectionThe angle between the reflected ray and the normal ray is known as the angle of reflection.
- 19Convex mirrorConvex mirrors bulge outwards in appearance and reflects at a wider angle near the edges than at the centre, causing images to appear distorted.
- 20Concave mirrorConcave mirrors curve inwards in appearance and reflect light inward to one focal point. This mirror shows different pictures depending on the distance.
- 21Concave lensA lens that has at least one surface that curves inwards. Lens are thinner at the centre.
- 22Convex lensLens that are think at the centre. The light passes through meets in the middle to form the focal point.
- 23PrismA prism is a transparent optical element with flat, polished surfaces that reflect light.
- 24Visible light spectrumThe visible light spectrum is the portion of the electromagnetic spectrum that is visible to the human eye (i.e. rainbow)
- 25WavesDisturbances that carry energy. There are 7 quantities that define every wave.
- 26Transverse WaveThe vibrations/oscillations are at right angles at the direction in which the waves travels _| (light,water and electromagnetic radiation)
- 27Longitudinal WavesA wave where the vibrations travel in the same direction as the movement of the wave. Shows compression and rarefaction. (sounds)
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- Karteikarten am Ohne Titel, erstellt von nhupro007 am 30/07/2014.
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