You know what it looks like… but what is it called?
TAKE THE QUIZ“equivalence law”
We have one entry that includes the term equivalence law.
quantum-equivalence law
noun: a principle of photoelectric action: when a quantum of radiation is involved in a photoelectric process its whole energy reappears in other forms since photoelectric processes do not absorb fractional quanta as do some other processes (as Compton effect)
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Merriam-Webster unabridged