Science Lab

Spectroscopy is the study of light. A spectrophotometer is a machine used to determine the absorbance of light at any given wavelength. It does this by using a source of white light through a prism, which gives multiple wavelengths that can be individually focused (Ayyagari and Nigam, 2007). Substances are put into cuvettes that are glass or quartz containers that light can easily travel through. The light that is being focused travels through the substance gets absorbed by the

The Beers Law calibration experiment used many concentrations of crystal violet solutions. Each of these solutions were test and analyzed in order to determine the absorbance of each concentration The results were than graphed and produced a slope of 1.00E05 with an intercept of -2.21E-02.

5. The degree of precision was to 3 significant figures obtained with the spectrophotometer. The major source of error in our experiment was not calibrating the spectrophotometer with distilled water.

• Secondly, we also used a colorimeter which is extremely accurate when it comes to measuring the percentage light transmission. As it measures the percentage light transmission as a numerical value.

In the story, Clinical Histories: From Soldier’s heart to PSTD, the author laid his foundation for understanding the reasons behind PSTD stress after combat engagement in veterans. PSTD is generally considered to be a mental illness. Combat stress is defined as the “expected and predicable emotional, intellectual, physical, and/or behavioral reactions of service member who have been exposed to stressful events in war or military operation other than war”. The American military community realized that engaging in combat could have physiological effects on individual. After World War 1, physiologist concluded that individuals reacted in wide ranges of ways during wartime, and it was their predisposition that resulted in neuropsychiatric disorder,

Beer’s Law is a direct liner relationship between the absorbance of light are a selected wavelength and the concentration the absorbing species in the solution. (Sullivan 241). Beer’s Law shows a relationship between several concentrations. To determine if the determine our data consistent with Beer’s law, we will plot a graph of absorbance versus concentration with a linear regression

In The Canterbury Tales, Geoffrey Chaucer introduced and described a variety of fictional characters that lived in the Middle Ages. It was the time period that European civilians were governed by a system called feudalism. Where kings were the head of the system and everyone was categorized in social classes. In the prologue of The Canterbury Tales the first character introduced was the knight. Geoffrey Chaucer depicts the knight correctly by characterizing him as a chivalrous and honorable man, which contrasted him from the rest who had bad behaviors and that he was a heroic figure.

The ending result of this experiment confirms that as five test tubes are lined up with the varying level of absorbance, different results in the level of absorbance will appear as well, this is visible in above table. Thus, this is due to the varying amount of water in the solution. The blank sample had a 0.30 in its level of absorbance.

The indices of refraction of water and plastic were 1.27 and 1.45 respectively, which were lower than the actual values of 1.33 and 1.46. The imprecision and the width of the light ray had decreased our calculated indices. Double refraction further decreased the index of refraction of water while the small plastic block was unable to cover the all the markings on the graph paper, causing difficulties in reading and a greater percentage error in the index of refraction of water. To increase the accuracy, we could use a graph paper with more markings since , and use a slit plate that has a smaller gap so that the light ray would be narrower and allow our measurements to be more precise. For the index of refraction of water, we could also measure

Finally, the last part of the experiment was to polarize the skylight. I had to go outside around 12 noon and looked at the sky through one of filters about 90 degrees to the direction of the sun. I looked at different regions of the sky and recorded my

Which of the following would be diffracted the most when incident on a slit of width 1 cm?

The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in the medium: n = c / v

Without light, life on Earth would not exist. It is the most essential component in all of the universe and it is very complex. In 1799, Thomas Young began to study sight and the behavior of light, otherwise known as optics. During his time, Young made many scientific advancements in the field of optics that have impacted the world we know today. This report will be discussing the topic of Thomas Young's Double-Slit Experiment. Take note of the diagrams as presented in paragraphs one and three. The main ideas of this topic are the properties of light, the interference of light, and the details that make up Young's experiment.

Is the frequency emanating from a wineglass proportional to the amount of water in the glass or the diameter of the glass?

A refractometer is aneoptical device that takes advantage of the fact that light passing through a liquid bends or refracts. The refractometer is a tool. It is used to help you select higher quality of foods containing more vitamins and minerals. They are also used to determine the concentration of dissolved solids in a solution. Cooking oil, molasses, syrup, and other thick liquids require a refractometerqcalibrated to read 30-90 Brix. Refractometer also is used in wine making. (Harrill, 1998) refractometer is also used to test to quality of fruits and vegetables.