Triple

Target class: early quantum theory
Context triple: [Bohr model of the atom, instanceOf, early quantum theory]

• A. law of black-body radiation
  The law of black-body radiation describes how an idealized object emits electromagnetic radiation with an intensity and spectrum that depend solely on its temperature, as quantified by Planck’s radiation formula.
• B. formulation of quantum mechanics
  The formulation of quantum mechanics is the conceptual and mathematical framework that describes physical systems in terms of wavefunctions or state vectors, operators, and probabilistic measurement outcomes, replacing classical deterministic trajectories.
• C. theory of relativity
  The theory of relativity is a fundamental framework in physics, developed by Albert Einstein, that describes how space, time, and gravity behave, especially at high speeds and in strong gravitational fields, unifying them into a single spacetime continuum.
• D. Einstein coefficient
  The Einstein coefficient is a parameter in quantum theory that quantifies the probability per unit time of spontaneous or stimulated emission or absorption of radiation by an atom or molecule transitioning between energy levels.
• E. result in quantum electrodynamics
  A result in quantum electrodynamics is a theoretically derived or experimentally confirmed prediction about how charged particles and electromagnetic fields interact, typically expressed through precise calculations of observable quantities such as scattering amplitudes, cross sections, or radiative corrections.
• F. None of above. chosen