Does Light Ever Travel Faster or Slower Than Speed C?

journeytospace
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I read from 'strange theory of light and matter' by feynman that light also travels faster and slower than C but on an average it travels at C..can anyone explain the reason behind or give me some links..
 
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I suggest that you reread which ever passage that you're alluding to, or perphaps copy, word for word, the exerpt, so that it may be explained to you in other words.
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!

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