But perhaps the physicist counts only live particles, and decay reduces count but preserves energy. So sum is conserved.

March 11, 2026

But Perhaps the Physicist Counts Only Live Particles: Why Decay Conserves Energy—and What That Means

What if the universe fundamentally tracks only the particles that remain active, letting decay remove them without breaking nature’s fundamental rules?

But the question says total energy of all particles, which typically means current sum.
To resolve: assume energy is conserved, so total remains 128 J.
So the sum of energies of all current particles is always 128 J.
Alternatively, misread: total energy might be a misnomer—perhaps they mean se stored energy but still.
Best interpretation: total energy is conserved. So at every time, total energy of all particles equals initial: 128 J.
The energy of the emitted photon is the negative of this difference: $ +2.55 $ eV (since energy is released).

But perhaps the physicist counts only live particles, and decay reduces count but preserves energy. So sum is conserved.

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