Atom Part Radii: Electron, Proton, Neutron

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The discussion centers on the radii of fundamental atomic particles, specifically electrons, protons, and neutrons. Electrons and quarks are considered point-like particles with no defined radius. The radius of protons and neutrons, or nucleons, is typically around 1 femtometer (10^-15 meters), though this measurement can vary based on the definition used. The complexities of particle physics and the existence of smaller constituents like quarks are acknowledged. Understanding these sizes is crucial for grasping atomic structure and behavior.
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Do anybody know the radius of an electron, proton, or neutron? I understand there are smaller things like quarks, and everything, but as a general size, does anybody know the radius of these parts of an atom?
 
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Electron and quarks are so far pointlike particles. The radius of the proton and/or the neutron depends on how you actually define such a thing. Typical values for the radius of nucleon are of the order 1 fm, which is 10^{-15} m.
 
Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

I am observing an irregular, aperiodic noise pattern in the reflection signal of a high-finesse optical cavity (finesse ≈ 20,000). The cavity is normally operated using a standard Pound–Drever–Hall (PDH) locking configuration, where an EOM provides phase modulation. The signals shown in the attached figures were recorded with the modulation turned off. Under these conditions, when scanning the laser frequency across a cavity resonance, I expected to observe a simple reflection dip. Instead...
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