MHB Is Light a Particle? Examining the Double-Slit Experiment

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Light must be considered a particle in specific circumstances, notably during the photoelectric effect, where light's particle-like properties are evident. The double-slit experiment highlights the paradox of light behaving both as a wave and a particle, challenging traditional scientific understanding. This experiment remains a focal point in discussions about the nature of light, as it demonstrates the complexities of quantum mechanics. Despite extensive study, a universally accepted explanation for the double-slit phenomenon is still elusive. The ongoing exploration of these concepts is essential for advancing scientific knowledge.
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Are there any circumstances in which light must be considered a particle?

If so, when?
 
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I think the double-slit experiment ...

Double-slit experiment - Wikipedia, the free encyclopedia

... is the most shocking paradox of science of all time. So far no one has been able to give a convincing explanation for the phenomenon, and I think to extend the frontiers of science you have to go from here...

Kind regards

$\chi$ $\sigma$
 

Thread 'Trigonometry problem of interest'

Seemingly by some mathematical coincidence, a hexagon of sides 2,2,7,7, 11, and 11 can be inscribed in a circle of radius 7. The other day I saw a math problem on line, which they said came from a Polish Olympiad, where you compute the length x of the 3rd side which is the same as the radius, so that the sides of length 2,x, and 11 are inscribed on the arc of a semi-circle. The law of cosines applied twice gives the answer for x of exactly 7, but the arithmetic is so complex that the...
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