1. Can a soccer ball Diffract?
i.e. bend, interference…
Show wave properties ?

3. When Particles / Waves are headed for the same place at the same time…
Particles experience:
Waves experience:
Collisions
Interference
Laura Fellman

4. What about Electrons? Are they…
Particles: -
Interference
or Waves:
Laura Fellman

5. Wave-Particle Duality
What is Light …
a Wave:
Wave-Particle Duality
and / or a Particle:
Photoelectric Effect
light
metal
collisions -

6. Corpuscular Theory of Light (1704)
Throughout History Scientists have debated whether light is made up of particles or behaves like a wave.
Corpuscular Theory of Light (1704)
Isaac Newton proposed that light consists of a stream of small particles, because it
travels in straight lines at great speeds
is reflected from mirrors in a predictable way

7. I think I will call them photons
Throughout History Scientist have debated whether light is made up of particles or behaves like a wave.
Einstein was able to show that light is both a particle and a wave.
I think I will
call them photons

9. Wave – Particle Duality?OR
“Waves can exhibit particle-like characteristics, and particles can exhibit wave-like characteristics”
Wave
Particles / Photons
Red
blue

12. Back to the Electron…

13. Wave & Particle Properties
There is a smooth transition of these properties across the electromagnetic spectrum
At low frequencies (radio waves) photons have a vanishingly small energy and the wave properties dominate
At high frequencies (x-rays, gamma-rays) it is the particle properties that dominate

14. In 1900, Max Planck explained the spectrum of the light produced by an incandescent body. He proposed:
that the atoms of the material didn't radiate electromagnetic waves continuously, but only at discrete values.
that energy was quantized; it is not a continuous quantity.
energy was related to the frequency by E=hf,
h is Planck's constant (h = x Js). ?!
Einstein suggested that, given the success of Planck’s theory, light must be emitted in small energy packets:
These tiny packets, or particles, are called photons.
Wave
Particles / Photons
Red
blue