| 170. |
When green light
shines on a photosensitive metal, no photoelectrons are emitted.
What can be done to get the metal to emit
photoelectrons?
|
|
A. |
Use a brighter
source of green light. |
|
| As
the graph to the right shows, there is a minimum frequency that must
be reached before photoelectrons are emitted.
Ultraviolet light has a higher frequency
than green light.
The Correct Answer is C. |
 |
|
|
B. |
Use red light
instead of green light. |
|
|
C. |
Use ultraviolet
light instead of green light. |
|
|
D. |
Decrease the angle
at which the photons hit the surface of the metal. |
|
