Quiz 3E Student ID: ______________ Name: ________________ , ___________________ |_____| Rubric Codes: last first DL Sect. # I certify that I will abide by the UC Davis Code of Academic Conduct. Signature: ______________________ ANSWERS WITHOUT WORK WILL RECEIVE NO CREDIT. MARK YOUR ANSWERS CLEARLY. ! y(x,t) = Asin(2"tT±2"x#+$) |f1-f2|=fbeat fcarrier=! f1+ f22 d sin θ ≈Δx node-node: L=nλn/2 antinode-node: L=(2n-1)λn/4 Speed of light: 3x108m/s 1) Below are two images. In the image on the left, a laser (λ=600nm) shines on two very narrow slits (d=10-6m). After passing through the slits, the light travels two meters onto a screen, and you see a pattern of light and dark spots as shown. You mark the location of each bright spot with a white dashed line. Next, you add a device to one slit, which modifies the wave in some manner. The light is projected onto the same screen. The image with the device is below right. Image without device: Image with device: a) Explain what the device must be doing to make the center dark. You do not need to tell me how the device physically manipulates the light, as long as you can tell me the effect of the manipulation. A correct answer without complete justification will receive minimal credit. b) Why is the overall pattern neither compressed nor stretched out? Explain in terms of pathlength