Is Planck's constant the key to understanding a quantum?

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The discussion centers around the definition of a "quantum" in physics, emphasizing that it is an adjective rather than a noun, which complicates the search for a universal definition. Planck's constant is highlighted as a fixed quantity of action associated with energy and time, crucial for understanding quantum mechanics. Participants debate the nature of photons and their emission, clarifying that photons are emitted when electrons drop to lower energy levels, rather than reaching a "top step." The conversation also touches on the relationship between quantum mechanics and wave physics, with some participants questioning the terminology used in the field. Overall, the thread illustrates the complexity of defining quantum concepts and the importance of understanding their foundational principles in physics.
  • #61
Born2bwire said:
Once again, you need to look up and learn what Lagrangian mechanics, path integral, and the action are if you are going to start asking questions based on assumptions of their character.

Can you please tell me whether my definition of action in post #1 is correct or not.
 

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