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|
The fastest speed in the universe is the speed of ____
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B. Experiments Supporting Particle Theory of Light (20th
century)
Experiment in the late 1800's baffles scientists.
Light is not acting like a wave!
Experiment scientists
can't explain
is called…
showmethephysics.com
|
Flash |
|
- when light is exposed
to the surface
of
certain metals,
the light energy is absorbed and electrons
are ejected
|
|
Light
(or
other electromagnetic radiation) |
Emitted electrons are called
PHOTOELECTRONS
 |
|
Photosensitive
metal |
The light’s energy causes
the emission of electrons
Try this at Home
Coanda
Effect, Leaf Blower, Volleyball
-
"Show Me The Physics"
|
|
|
Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. What is the photoelectric effect?
2. Electrons emitted from a metal surface due to light are called…
3. The photoelectric effect is evidence that light can behave like…
4. What causes the electrons to leave the metal in the photoelectric effect?
5. What is the fastest speed in the universe?