![]() ![]() Discuss, both qualitatively and quantitatively theĬhallenges associated with making Blue-ray discs and Blue-ray readers. Holds 700 Megabytes of data, determine the storage capacity of a DVD.Ĭheck your results. ![]() Įxplain carefully how you arrived at your prediction. equation will be used for measuring the thickness of your hair. Complies with ISO 13320 and JIS Z 8825-1 laser diffraction and scattering. (d) Derive an equation for calculating the wavelength of the laser light from your. Using this method, a fiber diameter, thickness measurement is possible with. Extrapolateįrom your results to predict a storage ratio. A particle size analyzer with the ability to precisely measure particle size. LASER diffraction is one of the simple and precise techniques for the real. Your results), determine the track spacing on the CD and DVD. Using two different color lasers (average You will need to reflect a laser off of the surface to see the Should be able to remove a small area of the coating. By scraping the CD surface and then applying strong tape, you The main challenge is that both CDs and DVDs haveĬoatings. Track separation (using the same process as you used for finding the thickness Should be able to produce a diffraction pattern and use it to determine the By shining a laser on one of the discs, you Procedure: At your station you should find In CDs and DVDs and deduce the ratio of their storage capacities. Of this exploration is to use laser diffraction to measure the track separation Most modern computers have opticalĭrives that use lasers to read information from spinning discs. You should also include all derivations of the formulas governing this phenomena that you used to deduce the hair/wire thickness.Ĭompact Discs and DVDs are the most common and least expensive portable storage Your report should include a carefully written discussion of Single Slit Interference, including diagrams showing how light interferes to create the patterns you observed in the lab. For each, you will need to explain exactly how you deduced the thickness from the fringe spacings and the geometry of your setup. Measure the thickness of two different thin wires/hairs. Once you have done this, you should be able to use your results to determine the thickness of hair/wire you used. Once you understand the theory behind a single slit diffraction pattern (which is different from a double slit interference pattern), you will need to deduce analytically/mathematically the connection between the light/dark fringe spacings and the thickness of the hair. Your group should research "Single Slit Interference". Unlike the other labs this this quarter, this lab requires you to research the observed phenomena independently. If you have comments, corrections or suggestions regarding this demonstration,įYSIK BASEN.DK was updated on Sunday, 16 June 2008, at 23:01.Diffraction Pattern made by shining a Laser on a Hair Link to demonstration in database at University of Iowa.ĭownload "laserWidth" (Software to calculate the diameter of a hair). Link to demonstration in database at University of Michigan. Greenslade, Jr.: " Diffraction by a cat's whisker", The Physics Teacher 38, 422 (2000). Hwu: " Diffraction pattern of a hair", Am. Shawlow: " Measuring the diameter of a hair by diffraction", Am. Clip the clothespin onto the laser so that it keeps the laser on. Bowlt: " Measurement of red blood cell diameters using a laser", Phys. Measure 1 meter (3.28 feet) from the wall and put your laser right at the 1 meter mark. These items can be measured by using methods of diffraction and interference known as Young’s Double Slit Experiment. This will show that curly hair has a more oval cross section, while straight hair is more round!Īs described in the references, one can also use laser light diffraction to measure sizes of other object like for instance blood cells or pollen.Ĭ. Measuring the Diameter of a Human Hair by Laser Diffraction Introduction Often it is necessary to determine the diameter of a fine wire, thin thread or other object that cannot be measure by convectional means. Several measurements should be made, where the angle of scattered laser light is varied. Place the hair so that it bisects the</. The demonstration should also be performed on both straight and curly hair. 3) Mount the hair on the bracket using tape.In this way, the students can test if they understand how to perform the measurement correctly. To test if the method works, one can start by measuring the thickness of a thin metal wire of known diameter (e.g. How does the thickness vary with sex, race, ages and hair color? For that purpose, one can download the program "laserWidth", which can be found in the references. The experiment is well-suited as a student exercise, where the students determine hair thicknesses of everyone in a class. Equation used to find the diameter of a hair. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |