Lecture Notes (Photoelectric Effect & X-Rays) - Dickey Physics
Lecture Notes (Photoelectric Effect & X-Rays) - Dickey Physics
Lecture Notes (Photoelectric Effect & X-Rays) - Dickey Physics
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- Einstein's theory said that light energy is bundled into discrete<br />
units now called photons; Einstein's theory worked to explain<br />
the PE, but could not explain interference of light<br />
- the result is two models of light whose basic ideas contradict one<br />
another; one says light behaves like a wave; the other said it<br />
acts like a particle<br />
X-<strong>Rays</strong>:<br />
- X-ray radiation was discovered in 1895 by a German physicist<br />
named Wilhelm Röntgen<br />
- like the PE, it too did not fit with classical physics theories<br />
- it eventually required the idea of quanta to completely explain<br />
their effects<br />
- the discovery of X-rays, which were often called Röntgen rays,<br />
had important consequences for atomic physics, medicine,<br />
and technology<br />
- Röntgen discovered X-rays while experimenting with cathode<br />
ray tubes; he noticed that a screen coated with a fluorescent<br />
material (barium platinocyanide) glowed from something<br />
being emitted by the cathode ray tube