Can a soccer ball Diffract?

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Presentation transcript:

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

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

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

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

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

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

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

Back to the Electron…

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

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 = 6.626 x 10-34 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

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