Which scientific concept was significantly influenced by Max Planck's theories?

Max Planck's theories significantly influenced the understanding of electromagnetic radiation, particularly through his introduction of the concept of quantization of energy. In 1900, Planck proposed that energy is not emitted or absorbed continuously, but rather in discrete packets called "quanta". This groundbreaking idea led to the formulation of Planck's law, which describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium.

Planck's work laid the foundation for quantum mechanics, fundamentally altering our comprehension of energy exchange at microscopic levels. His theories explained phenomena such as the photoelectric effect and black-body radiation, which classical physics could not adequately describe. Thus, the correct response highlights the pivotal role that Max Planck played in revolutionizing the study of electromagnetic radiation, marking a shift from classical to modern physics.