Chapter 28. Quantum Theory April 8 th , 2013. Quantum Theory. Two things are really different at the atomic and sub-atomic scale: Wave-particle duality Particles are waves, waves are particles Energies are not continuous but discrete. They vary by discrete increments called quanta
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April 8th, 2013
Two things are really different at the atomic and sub-atomic scale:
Wc = eV
h ƒc = Wc
KEelectron = h ƒ - h ƒc = h ƒ - Wc
(his discovery was in 1905)
KEelectron = h ƒ - h ƒc = h ƒ– Wc
With his explanation of the photoelectric effect, Einstein introduced the idea that
light is made of particles, now called photons,and that their energies are quantized.
We now say that:
a photon is a quantum of light
An electron and a neutron have the same wavelength. What is the ration of (a) their kinetic energies and (b) their momenta? Assume the speeds are low enough that you can ignore relativity.