Quantum Physics Study Guide
There have been two models of light. What are they and who first supported each? Particle: Newton
and wave: Huygens (1600s)
What determines the color with which a body glows? temperature
What is Planck's equation? E=hf
What does Planck's equation mean? Energy c...
There have been two models of light. What are they and who first supported each? ✅Particle: Newton
and wave: Huygens (1600s)
What determines the color with which a body glows? ✅temperature
What is Planck's equation? ✅E=hf
What does Planck's equation mean? ✅Energy comes in discrete packets. Energy of a photon is
proportional to its frequency.
What does Planck's equation explain? ✅Blackbody radiation problem and the photoelectric effect
What is Planck's constant (both what does it mean and what is its value)? ✅6.63x10-34 Js,(very small) it
is the proportionality constant relating a photon's energy and frequency.
What is a quantum? ✅Small packet (of energy)
What is a photon? ✅Quantum of light or particle of light
What is the photoelectric effect? ✅Emission of electrons from a metal when struck by certain
frequencies of light.
Why can't low frequency light cause the emission of electrons, regardless of the intensity of the light?
✅The energy per photon is too low to get electrons away.
Why does higher intensity high frequency light emit more electrons than low intensity high frequency
light? ✅Because high intensity light has more photons.
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