Planck's energy formula "E= hv" chalked on a dark green board, symbolizing quantum mechanics.

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Photo credit: © Maksim Grebeshkov / Alamy / Afripics
License: Royalty Free
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Keywords: academic, background, blackboard, chalkboard, classroom, concept, constant, dark, education, energy, equation, formula, frequency, handwritten, learning, mechanics, physics, planck, plancks, quantum, school, science, scientific, study, teaching, vector, vectors