The German scientist Max Planck challenged earlier claims about the characteristics of light and other forms of radiant energy; he posited that light was not emitted as a single constant wave
but rather in discrete tiny packages, or quanta.

Question

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Max Planck introduced the concept of quantization of energy, proposing that light and other forms of radiant energy are emitted in discrete units called quanta, laying the groundwork for quantum theory.

The German Scientist Max Planck Challenged Earlier Claims About the Characteristics