YOUNGâ€™S DOUBLE-SLIT EXPERIMENT
Shared by: wgv13363
YOUNG’S DOUBLE-SLIT EXPERIMENT In 1801, Thomas Young, an English physicist, obtained convincing evidence for the wave nature of light. He used sunlight shining on a double slit and viewed the pattern on a distant screen. If light were a particle, you would expect to see two bright spots opposite the two slits on the screen. In fact, he saw a series of bright and dark lines (an interference pattern). This is due to the light traveling different distances from each slit to the distant screen causing alternate points of constructive and destructive interference. You should refer to Section 16-1 in Holt for the details. In this lab you will use a red and green laser and will determine their respective wavelengths. The separation of the two slits is 0.2mm. ANALYSIS 1. Calculate the wavelengths of the lasers and compare to listed wavelength.(on laser). 2. Find your % error and estimate the uncertainty in EACH measurement. 3. EXPLAIN using a diagram how the interference pattern is formed. 4. Sample problem: Monochromatic light falls on two slits 0.04 mm apart. Successive fringes on a screen 5 meters away are 5.5 cm apart near the center of the pattern. What is the wavelength and frequency of the light?