HW11-solutions

# HW11-solutions - Munoz(gm7794 – HW11 – TSOI –(92515 1...

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Unformatted text preview: Munoz (gm7794) – HW11 – TSOI – (92515) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A beam of white light is incident on a trian- gular glass prism with an index of refraction of about 1.5 for visible light, producing a spectrum. Initially, the prism is in a glass aquarium filled with air, as shown. I n c i d e n t L i g h t V i o l e t R e d Prism Spectrum Aquarium If the aquarium is filled with water with an index of refraction of 1.3, which of the following is true? 1. The spectrum produced has greater sep- aration between red and violet than that pro- duced in air. 2. The spectrum has the same separation between red and violet as that produced in air. 3. There is no light come out of the prism. 4. The spectrum produced has less separa- tion between red and violet than that pro- duced in air. correct 5. The red light disappear. 6. No spectrum is produced. 7. A spectrum is produced, but the deviation of the beam is opposite to that in air. 8. The violet light disappear. 9. The position of red and violet are reversed in the spectrum. 10. The intensity of the light increases. Explanation: Since water has a larger index of refrac- tion than air (but still smaller than the glass prism), the deviation of light beam caused by refraction will be smaller. I n c i d e n t L i g h t V i o l e t R e d Prism Spectrum Aquarium Thus, the spectrum produced has less sep- aration between red and violet than that pro- duced in air. 002 10.0 points A double slit arrangement produces an inter- ference fringe for yellow sodium light. To produce narrower-spaced fringes, should red light or blue light be used? 1. Blue correct 2. Either 3. Red Explanation: Blue light has a shorter wavelength than both yellow and red light and will produce narrower-spaced fringes. 003 10.0 points A screen is illuminated by monochromatic light whose wave length is λ , as shown. The distance from the slits to the screen is L . y L d S 1 S 2 θ viewing screen At the second dark fringe on the screen (po- Munoz (gm7794) – HW11 – TSOI – (92515) 2 sition y on the screen), δ (the corresponding path length difference) and φ (the phase angle difference) is given by 1. δ = 11 2 λ and φ = 11 π 2. δ = 13 2 λ and φ = 13 π 3. δ = 9 2 λ and φ = 9 π 4. δ = 7 λ and φ = 14 π 5. δ = 2 λ and φ = 4 π 6. δ = 5 λ and φ = 10 π 7. δ = 4 λ and φ = 8 π 8. δ = 3 2 λ and φ = 3 π correct 9. δ = 5 2 λ and φ = 5 π 10. δ = 3 λ and φ...
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## This note was uploaded on 06/10/2011 for the course PHY 302l taught by Professor Morrison during the Summer '08 term at University of Texas.

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HW11-solutions - Munoz(gm7794 – HW11 – TSOI –(92515 1...

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