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17. The physical construction of the photocell was
  discussed in the lesson. If the following changes
  were made, what e...
18. Suppose that ultraviolet light is required
     before an electric current is produced in a
     photocell. The wave t...
19. Einstein's photon theory was able to explain
      why light with only a minimum frequency is
      necessary to dislo...
Title: Nov 13-9:54 AM (4 of 4)
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17,18,19,20

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17,18,19,20

  1. 1. 17. The physical construction of the photocell was discussed in the lesson. If the following changes were made, what effect would there be on the current? a) If the photocell tube did not have the air inside evacuated, would there be more of a current or less? b) If the glass making up the photocell was not made up of quartz, but ordinary glass, would this result in more of a current in the photocell or less? c) If the cathode was made up of a harder metal such as steel, would there be a larger current or less? Title: Nov 13-9:40 AM (1 of 4)
  2. 2. 18. Suppose that ultraviolet light is required before an electric current is produced in a photocell. The wave theory and the photon theories predict different effects if very bright orange light shining for a long time is used instead. What does each theory predict and which theory makes the correct prediction? Title: Nov 13-9:48 AM (2 of 4)
  3. 3. 19. Einstein's photon theory was able to explain why light with only a minimum frequency is necessary to dislodge an electron, and that light below this frequency will not, no matter how bright the light is. How was he able to explain this? Title: Nov 13-9:52 AM (3 of 4)
  4. 4. Title: Nov 13-9:54 AM (4 of 4)

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