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PH7 Ch 22 test 2
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1. Water has an index of refraction of 1.333. What is the speed of light through it? (c = 3.00 X 108 m/s)


  • 2.25 X 108 m/s



2. A ray of light strikes a thick sheet of glass (n= 1.5) at an angle of 25 deg. with the normal. Find the angle of the ray reflected off the glass surface with respect to the normal


  • 25 deg



3. A light ray enters and passes through a block of glass. What can be stated with respect to its speed after it emerges from the block


  • Speed is same as that before it entered glass



5. As a monochromatic light ray is transmitted through an air-to-glass boundary, what happens to the wavelength?


  • decreases



6. Tripling the wavelength of the radiation from a monchromatic source will change the energy content of the individually radiated photons by what factor?


  • 0.33



7. According to the photon energy formula, tripling the frequency of the radiation from a monochromatic source will change the energy content of the individually radiated photons by what factor?


  • 8.0 x 10-19 J



9. If the speed of light through an unknown liquid is measured at 1.8 x 108 m/s, what is the index of refraction of this liquid?


  • 1.67



10. What is the angle of incidence on an air-to-glass boundary if the angle of refraction in the glass =(n= 1.52) is 25 deg ?


  • 40 deg



11. A monochromatic light source emits a wavelength of 490 nm in air. When passing through a liquid the wavelength reduces to 429 nm. What is the liquid’s index of refraction?


  • 1.14



12. Helium-neon laser light has a wavelength in air of 632.8 nm. What is the energy of a single photon in the beam? (h = 6.626 x 10-34 J•s and c = 3.00 x 108 m/s).


  • 3.14 x10-19 J



13. When light from air hits a smooth piece of glass with the ray perpendicular to the glass surface, the part of the light passing into the glass:


  • will not change its frequency.