What symbol represents Planck's constant?

Planck's constant is represented by the symbol "h." This constant plays a fundamental role in quantum mechanics, specifically in the equations relating to energy quantization. It establishes the relationship between a photon’s energy and its frequency, expressed by the equation (E = hf), where "E" is the energy of the photon, "f" is the frequency, and "h" is Planck’s constant.

The importance of Planck's constant extends to explaining phenomena such as the photoelectric effect and the quantization of energy levels in atoms. It is a vital constant in physics, having a value of approximately (6.626 \times 10^{-34} , \text{Js}), which is crucial for calculations at the quantum level.

The other symbols have different meanings in physics. For instance, "E" generally denotes energy, while "c" is the symbol for the speed of light in a vacuum, and "f" represents frequency. Each of these has significant roles in various equations and laws of physics, but they do not denote Planck’s constant.