Nt1210 Lab 10.1

Glow sticks are colorful, fun, and at sometimes helpful in cases because of their luminescence, luminescence is the emission of light by a substance that has not been heated, as in fluorescence and phosphorescence. Luminescence is caused by an object being subjected to an outside source of energy. Glow sticks are composed of diethyl phthalate (solvent), a fluorescent dye, TCPO, sodium acetate, and hydrogen peroxide. The earliest patent says they were invented in June 1965 by Bernard Dubrow and Eugene Daniel Guth. Since 1962, the military has found many uses for glow sticks which are used in; non-tactical military ops, safety, and night operations. Glow sticks are now put in military safety kits to mark things or places at night.

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. (Similarly, if a light ray passes through an obstacle that forces it to speed up, it will bend away from the line perpendicular to the surface it strikes.) This is the principle of refraction.

Perception categories that significantly influenced walking frequency were landuse, and aesthetics and amenities. The safety, directness and continuity perception categories were not significant but had weak to moderate associations with land use and aesthetics perception. This implies improving perception of one category is bound to improve or negatively impact the perception of a correlated category. For example landuse perception was correlated with directness perception - which is intuitive, given that directness measured quick and easy access to land uses. Conversely, directness was moderately correlated with safety, which is intuitive given that enclosed communities have lower traffic flows as well as speed limits that are conducive

Photoelectric interaction is one of the main interactions in producing x-rays. This occurs when an inner shell electron is knocked out leaving a hole that needs to be filled. It will be filled by an outer shell electron which will be filled by an auger electron eventually. Photoelectric interaction doesn’t have as much scatter compared to the other interactions. This is due to the photons being almost completely absorbed by the patient as the photons pass through the body to hit the image receptor.

Have you ever wonder how does a crime scene investigator, known as a CSI, discover blood spatter on different fabrics, which is not visible to the human eye? The key is bluestar. According to the article “Influence of Bluestar Reagent on Blood Spatter Stain of Different Fabrics” by Arnon Grafit, bluestar is a “luminol-based reagent that is applied by spraying on surface.” Not only that, but “it helps obtain DNA and to analyze spatters patterns. By analyzing the article the reader is able to understand how bluestar works through the rhetorical techniques used. First, logos which shows how the author reasons and the soundness of the argument. Second, ethos which shows the writers credibility and integrity. Lastly, diction by choice of words used.

The Noctiluca scintilla’s is commonly known as a sea sparkle. It is a bubble- like

Hue refers to a particular wavelength of spectral color to which we give a name.

In 1924, the good people of Albion New York were graced with electricity, and believe it or not, most of them were outraged. According to local historian Edward Winslow, “the elderly claimed that living by such a ferocious light was practically impossible”. By Christmas of that year, residents staged an unsuccessful protest against the forces of modernity.

wave. Amplitude is the distance from the crest to the trough. All of the pieces that

“Is my red the same as your red?”— you’ve most likely posed some form of this inquiry once in your life, but the color of an object is much more expansive and complex that what humans observe on a day-to-day basis. That red strawberry you see is not built with red particles that look red through every light and spectrum it is observed through. Instead, how we perceive the light bouncing off the subatomic particles within the various substances and elements which we glance upon is what affects their color. Color is a combination of the absorption of various wavelengths of visible light across the color spectrum and the atomic emissions spectrum, the change of quantized energy levels in the reaction between photons and electrons, and the resulting

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. The resultant spectrum is usually a graph of intensity of emitted or absorbed radiation versus wavelength or frequency. The spectra used in spectroscopy varies from ultra-violet, visible, infra red ranges. The wavelength range for the three spectra are 0-400, 400-700 and above. In short, spectroscopy use to gain insight into the structure of molecules or the concentration of atoms or molecules in a sample. The chemists use infrared radiation to determine the structure of a new molecule, geologists uses ultraviolet radiation to determine the concentration of particular element in rock or

Bioluminescence is the production of light as a result of a chemical reaction without the use of heat within a living organism. For bioluminescence to occur usually two substances and a by-product such as oxygen are required. In the majority of bioluminescent reactions, the chemical reaction which leads to bioluminescence is the oxidation of a molecule called luciferin. Luciferin, which is the substrate in this chemical reaction, is the chemical in the reaction which produces light. The reaction rate of this reaction is controlled by an enzyme called Luciferase which acts as a biological catalyst. A catalyst is a chemical which interacts with the substrate in the reaction in order to alter the rate of the chemical

Have you ever noticed the term "Fluorescence" in a GIA Diamond Assessment Report? Did you know that some diamonds show effects under ultraviolet light?

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. In the same time, transverse waves, another type of waves, doesn’t need a medium to travel through, and the particles in it move perpendicularly to the direction of the wave.

From the three boundaries above the light wave that refracted the most was the air to diamond boundary. We can see this, from the difference between the angle of incidence and the angle of refraction. The difference is greatest in the air to diamond boundary. This large amount of refraction is due to