What Happens at the Sub-Atomic Level?

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Matter at the sub-atomic level involves particles such as protons, neutrons, and electrons, which are the building blocks of atoms. These particles interact through fundamental forces, leading to various phenomena like bonding and reactions. Understanding these interactions requires knowledge of quantum mechanics, which describes the behavior of particles at this scale. Resources like Particle Adventure provide accessible explanations and visualizations to aid comprehension. Engaging with specific questions can further clarify complex concepts in sub-atomic physics.
Obaidullah
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what happens to matter at sub-atomic level?

I studied physics in 8th grade, i am not very good at this. so please whoever explains this to me in simple language.

Thank you

Regards
 
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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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