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Dual Nature of Light. Photoelectric effect: when light falls on a metal surface, electrons are emitted with kinetic energy K. Some experimental facts: The maximum value of K is independent of the light intensity. No electrons are emitted if the incident photon frequency is below a threshold value. K increases with increasing photon frequency.
We have long known that EM radiation is like a wave, capable of interference and diffraction. We now see that light can also be modeled as particles—massless photons of discrete energy and momentum. We call this twofold nature the particle-wave duality, meaning that EM radiation has properties of both particles and waves. This may seem ...
2 Δεκ 1999 · The nature of the new radiation, discovered by Röntgen in 1895, was by no means clear in 1901 when he was awarded the Nobel Prize. In the beginning the only property which was found in common with light was that of propagation in straight lines.
This new constant of nature (with the dimension of energy multiplied by time) connects the quantum of energy with the frequency of light, v, through the formula E = hv. Planck himself resisted the idea that light in vacuum consists of particles, later on called photons.
19 Σεπ 2023 · Wave-particle duality is a fundamental concept in physics that describes the dual nature of matter and light. It suggests that particles like electrons and photons can exhibit wave-like and particle-like properties depending on the experimental setup.
In this chapter, we study the basic properties of light. In the next few chapters, we investigate the behavior of light when it interacts with optical devices such as mirrors, lenses, and apertures.
Define quantum states and their relationship to modern physics; Calculate the quantum energy of lights; Explain how photon energies vary across divisions of the electromagnetic spectrum
