2.1 - Quantum theory Flashcards
what are the 3 experimental observations which cannot be explained by classical physics?
black-body radiation curves
emission and absorption spectra
the photoelectric effect
state an example of light behaving as a particle
photoelectric effect
state an example of light behaving as a wave
young’s double slits
state an example of electrons behaving as a particle
cathode ray tube
state an example of electrons behaving as a wave
electron microscope
what is quantum tunnelling
when a particle exists in a position that according to classical physics,
it has insufficient energy to occupy. This occurs because the particle has an uncertain position.
what is a blackbody emitter
an object which does not reflect light incident on it but absorbs it
explain the photoelectric effect
light below a certain frequency, regardless of intensity, could not eject an electron from a metal plate, however, light above the certain frequency could always cause an ejection regardless of intensity
why did the uv catastrophe occur
classical physics had falsely predicted that the short wavelengths emitted by a blackbody emitter would increase in intensity towards infinity. However, a peak wavelength was produced, and shorter wavelengths than this peak were less intense.
what are produced in an emission/absorption spectrum
a series of discrete lines
what factors are unable to be known simultaneously about a quantum particle?
position and momentum, lifetime and energy change
