👉 Exclusively-light particles, often referred to as photons, are fundamental entities that constitute light and other forms of electromagnetic radiation. These particles are massless, meaning they have no rest mass, and they travel at the speed of light in a vacuum, approximately 299,792 kilometers per second. Photons are the quanta of the electromagnetic field, meaning they carry discrete packets of energy proportional to their frequency, as described by Planck's relation \( E = h\nu \), where \( E \) is energy, \( h \) is Planck's constant, and \( \nu \) is the frequency. Unlike matter particles, photons do not interact with matter in the same way; they can pass through most materials without being absorbed or scattered, making them crucial for understanding phenomena like blackbody radiation, the photoelectric effect, and quantum entanglement. Their behavior is governed by Maxwell's equations, yet they exhibit particle-like properties such as momentum and energy transfer, bridging classical electromagnetism with quantum mechanics.
