![]() ![]() As discussed in the previous part of Lesson 3, the amount of reflection is dependent upon the dissimilarity of the two media. When a wave reaches the boundary between one medium another medium, a portion of the wave undergoes reflection and a portion of the wave undergoes transmission across the boundary. In this part of Lesson 3, we will investigate behaviors that have already been discussed in a previous unit and apply them towards the reflection, diffraction, and refraction of sound waves. Possible behaviors include reflection off the obstacle, diffraction around the obstacle, and transmission (accompanied by refraction) into the obstacle or new medium. Rather, a sound wave will undergo certain behaviors when it encounters the end of the medium or an obstacle. Refractive index of different material.Like any wave, a sound wave doesn't just stop when it reaches the end of the medium or when it encounters an obstacle in its path. What color refracts more? Picture below shows a similar quick experiment without having a dark room.At this time you will see how different colors refract different amounts.Place a prism in the path of this light and keep a white paper behind that in a way that light passes trough the prism and gets to the paper.This makes the best light source for this experiment. Then you cover the window with black construction paper and leave only one small hole or slot about 1 mm wide and 20 mm long. You need a room that gets a lot of sun light trough a clean window. If you want to repeat this experiment, following are some hints: This experiment has been done many times and we have seen the results in books and we know that this will happen. If each color refracts a different amount, the prism must be able to separate these colors. White light consists of many different color lights. The frequency of visible light is referred to as color, and ranges from 430 trillion Hz, seen as red, to 750 trillion Hz, seen as violet.įor this experiment we pass a straight beam of white light trough a prism. So we need to test the refraction of different color lights. As we already know, different color lights have different frequencies. For this experiment we will keep all other variables constant and only change the light frequency. This experiment is designed to show how does the light frequency affect the light refraction. A series of experiments that includes a control is called a “controlled experiment.” Without a control you cannot be sure that changing the variable causes your observations. They can be the hardest part of a project. Dependable controls are sometimes very hard to develop. A control is a neutral “reference point” for comparison that allows you to see what changing a variable does by comparing it to not changing anything. The only difference is that no experimental variables are changed. It is a separate experiment, done exactly like the others. For an experiment to give answers you can trust, it must have a “control.” A control is an additional experimental trial or run. ![]() This list is called an experimental procedure. Make a step-by-step list of what you will do to answer each question. This project is an opportunity to do some experiments and find some answers to these questions.ĭesign an experiment to test each hypothesis. Also if refraction, reflection, and diffraction are just the property of material, we may be able to find materials that act differently.Īlso I want to know what other factors (if any) are involved. If it be a property of light, we may be able to find some other lights that do not refract (bend), reflect, or diffract. One major question in my mind is that if these are the properties of light or the properties of objects and material? These all shows that light refraction, reflection and diffraction are important properties that demand more attention and study. Magicians make an elephant disappear using the light reflection and mirrors. Knowledge of light is also used in magic and illusions. ![]() In a tour from an oil company, I saw a device that can identify the density and the type of oil while the oil was passing trough a glass tube with a speed of about 35 miles per hour. Light refraction has also many industrial applications. ![]()
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