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17,18,19,20
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. 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. 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)
