Planck's constant, denoted by h, is a fundamental constant in quantum mechanics and is named after German physicist Max Planck, who introduced it in 1900. It has a value of approximately 6.626 x 10^-34 joule-seconds. Planck's constant plays a crucial role in determining the energy of quantum particles and the wavelength of electromagnetic radiation. It is a key component in various equations describing the behavior of particles at the atomic and subatomic levels.
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