Quantum mechanics arose gradually from theories to explain observations that could not be reconciled with classical physics, such as Max Planck's solution in 1900 to the black-body radiation problem and the correspondence between energy and frequency in Albert Einstein's 1905 paper, which explained the photoelectric effect. These early attempts to understand microscopic phenomena, now known as the old quantum theory, led to the full development of quantum mechanics in the mid-1920s by Niels Bohr, Erwin Schrödinger, Werner Heisenberg, Max Born, Paul Dirac, and others.

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• quantum mechanics concept
• Albert Einstein concept
• Niels Bohr concept
• Werner Heisenberg concept
• Max Planck concept
• Erwin Schrödinger concept
• classical physics concept
• Paul Dirac concept
• Max Born concept
• photoelectric effect concept