Unit D Summary: Light and Geometric Optics
10.1:Light and The Electromagnetic Spectrum
Chapter 10.1 covers light and the electromagnetic spectrum. This chapter starts off by describing how light is a form of energy that travels in waves. The properties of said waves include a crest (the highest point of the wave), the trough (the lowest point of the wave), and the rest position (the level of a wave without energy). The three most important properties of a wave are the wavelength, the amplitude, and the frequency. The wavelength is the distance from one point on a wave to the next identical point on the next wave. The amplitude is the distance from a waves rest position to either the crest or trough of the wave. The frequency is a rate which represents the amount of times a wave repeats …show more content…
This reaction does not cause a rise in temperature.
One other source is triboluminescence which is light produced from friction. Another source is electric discharge which is light produced when an electrical current passes through air or another, like neon, that produces a glow.
Another source is light-emitting diode which is light produced when an electrical current passes through a semi-conductor which controls how well is conducts electricity.
Another source of light is an organic light-emitting-diode which is light produced when several thin layers of organic material are exposed to an electrical current and glow as a result. Another source is plasma displays which is light produced when an electrical signal causes, a gas similar to neon, to release ultraviolet radiation.
One last source of light is liquid crystal display. This is light produced when a white light is placed behind a liquid crystal. That crystal can then change the orientation of its molecules and block or allow light as required. This is only possible, however, when electricity is applied to the
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His choice of words does not just bring understanding to the reader, but it also helps the reader to think. In the article the author uses the word chemiluminescent, which is a chemical reaction that does not produce significant quantities of heat. He explains that with this it would be hard for them to find the evidence. Another word he used is fluorescence, which is the visible or invisible radiation emitted by certain substances as a result of incident radiation. Throughout the article the author uses plenty other word for the article, but he mainly elaborate on these two
Wave properties: Frequency: How many waves go past a point in one second; measured in hertz (Hz). The higher the frequency, the more energy in the wave. 1 Ask the children to play 'verbal tennis' in partners on words that describe sounds (eg loud, quiet, vibration, pitch). One child says one word related to sound, then their partner says another and so on. 2 Ask the children what things make sounds.
4.7.5 Data Preservation and Isolation from the Network. The main purpose of a digital forensic report is to keep the data integrity, avoiding any type of data alteration, in order to present valid evidences, for instance in a court. The use of not valid software to check the stored information in a mobile phone can alter these information. The action of receive new data can alter the information stored, for instance an automatic firmware update, or remote device control with the risks involved. Therefore, it is extremelly important have the device completely isolated from the network.
Unexpectedly, when a beam of electrons were passed, multiple bands of maxima and minima, the interference pattern was observed. The interference pattern represents superposition which is a wave characteristic. The double-slit experiment successfully showed the wave characteristic of
Light Refraction Lab Final Write-Up When light passes through any obstacle, it is affected in different ways, especially when the obstacle is transparent. In this lab, the objective was to show students what happens when light passes through water. “When light refracts into a substance in which it must slow down, the light ray will bend toward a line perpendicular to the surface it strikes” (Wile). Water forces a light ray to slow down, and so the light ray will bend.
That energy will then be released as a characteristic photon (Shepard 2003). The space created in the outer shell is filled with a higher energy electron, producing another secondary energy exchange (Bushong 2008). This exchange continues to occur, leading to secondary x-ray or characteristic x-ray being produced. It occurs until a higher energy level doesn’t exist in providing another electron. The fluorescent radiation is when a characteristic photon is produced by incoming photons and is the number of photons being produced.
A wave is a rhythmic disturbance that carries energy, not matter, through the particles of a medium, one of many aspects that make up what we call waves. A wave is made up of many parts. One of them is the medium. The medium is the material through which the wave travels.
Introduction Fluorescents are a large family of light sources. There are three main types of fluorescent lamps: cold cathode, hot cathode, and electroluminescent. They all use phosphors excited by electrons to create light. A fluorescent lamp or a fluorescent tube is a low pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light.
The amount of refraction a light wave experiences is expressed by the difference between the angle of refraction and the angle of incidence. The light wave traveling to the boundary at an angle of incidence of 45 degrees for example will refract towards the normal because the medium it is now travelling through ( water, glass, diamond ) is more optically dense than the first medium ( air ). Below is a diagram of a light wave approaching three boundaries at an angle of 45 degrees. The medium is different in each example, causing different amounts of refraction. From the three boundaries above the light wave that refracted the most was the air to diamond boundary.
white light) is allowed to fall on a substance, then the frequencies absorbed by the substance are studied. This type of spectrum is an absorption spectrum and called an absorption spectroscopy. The spectrum shows that the light separated into its constituent wavelength and intensity plotted at each wavelngth. This separation process is known as Spectroscopy. In spectroscopy the emitted or absorbed radiation is split into the various frequency components and the intensity is measured by means of an instrument called a spectrometer.
Activities for Unit IX Give definitions for the following terms: Hue refers to a particular wavelength of spectral color to which we give a name. Value refers to relative lightness or darkness from white through grays to black. Tint refers to the end color after the addition of white to a hue. The color is a lighter version of itself when white is added.
The world around you is full of waves. Waves can be anywhere, it can be in the air you breathe and the sound you hear, waves could be in ocean ripples and in the sunlight energy you get heat from. A wave is a disturbance that transfers energy from one place to another, some types of waves need a material to travel through which is called a medium. There are types of waves, one type of wave is a longitudinal wave, this type of wave has particles that move back and forth in the same direction of the wave. Sound waves are longitudinal wave; longitudinal waves need a medium to travel through.