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To address your second concern, all quantum particles (this includes photons) have wavelike properties (including wavelength), and thus can show wavelike effect
by graphene 17y ago
To address your second concern, all quantum particles (this includes photons) have wavelike properties (including wavelength), and thus can show wavelike effects, such as interference. For example, a ray of light contains a huge number of photons and obeys certain wave equations, but if the intensity is decreased enough, the light is found to impinge in discrete units, which have been named photons.
When Feynman says light is particles, he means that it comes in discrete units, not that it behaves as a stream of tiny billiard balls with classical behavior.
- itistoday 17y agoI'm aware of this, but this is the exact sort of caveat that he failed to mention in his lecture, despite promising his audience that he would tell them exactly his understanding of the situation.