Physics Prac - Mesuring Wavelengths Of Light :: essays research papers

Aim To determine the estimate value of l for red slack using a diffraction kit. supposition Diffraction of light is one explanation of the wave theory of light. Francesco Grimaldi first sight this type of behvaiour from light. However, Thomas Young was the scientist that was able to derive a numeral formula where l can be calculated. The original sample complicated sending white light into a screen with two teentsy holes to serve as point sources. The light from these sources was then projected onto a screen and light and dark bands were observed. The mathematical formula could then be used after taking certain measurements. Equipment Light source (Ray calamity), rosy-cheeked cellophane, Double- grab mistake, and Measuring rod (can be already attached to Ray box. rule1.Set up the ray box and place red cellophane in clip so that it is over the bulb.2.Switch on ray box and stand approximately two meters away from the ray box, hold the luxate up to your eye and look through one of the double slit patterns into the light. Observe disturbance pattern.3.While looking through the slide, have somebody move the white marker along the slide rule until its strand is approximately halfway inside a dark or light band.4.Take measurement down and then repeat step 3 and gain measurement for other dark or light bands.Results The results gained from the experiment were conclusive and accurate when compared to the original value for l for red light. beneath is a table of the measurements recorded and calculations to gain l.Calculation (cont) The value d was calculated by placing the slide in a projector and then on the whiteboard (acting as a screen), marks were made. The slide had a measurement of 1cm and from this the balance 351 was established. Measurements were then made and the slides actual measurements were determined. For this particular experiment, the slide marking D was used. L was measured also using wide-eyed trigonometry. The person viewing through the slide sat at a table and then looked down at the ray box on an angle.