Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature. The correct expression related to Planck's law is:
E = hf
Here,
- \( E \) is the energy of a photon,
- \( h \) is Planck's constant, and
- \( f \) is the frequency of the electromagnetic radiation.
This equation establishes the relationship between the energy of a photon and its frequency, showing that energy is quantized in discrete packets (quantum).
The other equations mentioned represent different physical principles:
- \( F = ma \) is Newton's second law of motion.
- \( E = mc^2 \) is Einstein's mass-energy equivalence principle.
- \( F = hm \) doesn't refer to a standard physical law.
So, the response to your question is that Planck's law is represented by E = hf.
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