See Why the Sky Is Blue and Sunset Is Red - Easy Experiment

See Why the Sky Is Blue and Sunset Is Red - Easy Experiment The sky is blue on a sunny day, yet red or orange at sunrise and sunset. The different colors are caused by scattering of light in the Earths atmosphere. Here is a simple experiment you can do to see how this works: Blue Sky - Red Sunset Materials You only need a few simple materials for this project: WaterMilkTransparent container with flat parallel sidesFlashlight or cell phone light A small rectangular aquarium works well for this experiment. Try a 2-1/2-gallon or 5-gallon tank. Any other square or rectangular clear glass or plastic container will work. Conduct the Experiment Fill the container with  about 3/4 full of water. Turn on the flashlight and hold it flat against the side of the container. You probably wont be able to see the beam of the flashlight, although you may see bright sparkles where the light strikes dust, air bubbles, or other small particles in the water. This is much like how sunlight travels through space.Add about 1/4 cup of milk (for a 2-1/2 gallon container- increase the amount of milk for a larger container). Stir the milk into the container to mix it with water. Now, if you shine the flashlight against the side of the tank, you can see the beam of light in the water. Particles from the milk are scattering light. Examine the container from all sides. Notice if you look at the container from the side, the flashlight beam looks slightly blue, while the end of the flashlight appears slightly yellow.Stir more milk into the water. As you increase the number of particles in the water, the light from the flashlight is more strongly sc attered. The beam appears even bluer, while the path of the beam furthest from the flashlight goes from yellow to orange. If you look into the flashlight from across the tank, it looks like it is orange or red, rather than white. The beam also appears to spread out as it crosses the container. The blue end, where there are some particles scattering light, is like the sky on a clear day. The orange end is like the sky near sunrise or sunset. How It Works Light travels in a straight line until it encounters particles, which deflect or scatter it. In pure air or water, you cant see a beam of light and it travels along a straight path. When there are particles in the air or water, like dust, ash, ice, or water droplets, light is scattered by the edges of the particles. Milk is a colloid, which contains tiny particles of fat and protein. Mixed with water, the particles scatter light much as dust scatters light in the atmosphere. Light is scattered differently, depending on its color or wavelength. Blue light is scattered the most, while the orange and red light is scattered the least. Looking at the daytime sky is like viewing a flashlight beam from the side you see the scattered blue light. Looking at sunrise or sunset is like looking directly into the beam of the flashlight you see the light that isnt scattered, which is orange and red. What makes sunrise and sunset different from the daytime sky? Its the amount of atmosphere the sunlight has to cross before it reaches your eyes. If you think of the atmosphere as a coating covering the Earth, sunlight at noon passes through the thinnest part of the coating (which has the least number of particles). Sunlight at sunrise and sunset has to take a sideways path to the same point, through a lot more coating, which means there are a lot more particles that can scatter light. While multiple types of scattering occur in the Earths atmosphere, Rayleigh scattering is primarily responsible for the blue of the daytime sky and reddish hue of the rising and setting sun. The Tyndall effect also comes into play, but it is not the cause of blue sky color because molecules in air are smaller than the wavelengths of visible light. Sources Smith, Glenn S. (2005). Human color vision and the unsaturated blue color of the daytime sky. American Journal of Physics. 73 (7): 590–97. doi:10.1119/1.1858479Young, Andrew T. (1981). Rayleigh scattering. Applied Optics. 20 (4): 533–5. doi:10.1364/AO.20.000533

Journal opinion article Essay Example | Topics and Well Written Essays - 500 words - 1

Journal opinion article - Essay Example This move is stressed for by the European Union as well as the United States of America. Russia on the other hand aims at maintaining its influence on Ukraine and other smaller states of the region which will allow it promoting its products, services and large scaled enterprises such as Gazprom and many more gas and natural resources providing companies and multinationals. Given the fact that Ukraine is largely reliant upon Russia for the fulfillment of its citizens needs, the natural gas resources availability and purchase from Russia is another constraint. With the recent strangulation of ties between them, and the time barring factor and sword hanging over the heads of Ukrainians, the Kiev administration is deeply concerned about the possible backlashes of it. Naftogaz is another stakeholder in the entire event and aims to undermine the impact and influence of Gazprom. Ukraine’s economy that is already hit by the economic recession and other obstacles has found its overall usage and consumption reduced by a given 5 to 9 percent decrease in last year or so. With Russia offering to reduce the rates to 385 dollars per cubic meter, Ukraine still insists on bringing the rates down to the originally set rates that were in place previously. European Union holds key interest and key position with regard to the overall debacle of Ukraine- Russia crisis has beefed up its activities in bid to find an amicable solution. European Union has its backing towards Ukraine and aims at standing by Ukraine in these rough times where Russia has already annexed Crimea (Ortlepp, 161) and is using its economic strength to its benefit (Kolyandr). With the increase in the rates, Ukraine is subsequently left with the impact of higher debts to pay and the time running out on them, the E.U and other global entities have stepped in, in hope to resolve the overall issue and prevent Ukraine from

Childhood obesity Research Paper Example | Topics and Well Written Essays - 500 words

Childhood obesity - Research Paper Example Childhood obesity is one of most critical issues related to children. It is the medical condition which puts adverse impact on the health of such children who are very fat as compared to other children of their age group. It is a very serious issue because childhood obesity can cause heath problems as well as psychological problems for the children. Many factors lead to childhood obesity, such as, lack of exercises, poor nutritional habits, and eating junk food. This medical condition may also linger into adulthood creating risks for the health of children, such as, heart problems, high blood pressure, and diabetes. This research paper is going to be very important for parents and nutritionists as they will not only get to know the impact of childhood obesity on young children but also the ways they can use to deal with this health problem. The statistics will also be there to reveal how many parents actually have awareness of this health issue. Parent involvement in their children’s physical activities and nutritional habits at home and at school will be the main focal point of the research. Parizkova, J., & Hills, A. (2005). Childhood Obesity: Prevention and Treatment (2nd ed.). Florida, FL: CRC Press. (This book will make the researcher know some of the core developmental aspects of obesity and their influences on early stages of life) Robinson, N. (2011). What Is Childhood Obesity?. Retrieved from http://www.wisegeek.com/what-is-childhood-obesity.htm (This article is a great source of information regarding childhood obesity. It includes main causes and risks related to childhood obesity) Smith, C. (1999). Understanding Childhood Obesity. Mississippi: University Press of Mississippi. (This book will provide the researcher with the knowledge of every aspect of childhood obesity. It will provide us with a great help in research). Waters, E., Swinburn, B., Seidell, J., & Uauy, R. (2010). Preventing Childhood Obesity: Evidence Policy