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Accelerating charged particles, electrons or protons, emit electromagnetic waves. This means if they are moving with a constant velocity, or they are stationary, they will not emit electromagnetic radiation (photons).

An electron in an atom (in an excited state) can emit a photon, and drops to a lower energy level. But a free, isolated, non-accelerating electron will not spontaneously emit a photon, because conservation of momentum/energy will not hold.

Also, a proton (in a nucleus) can go through a different radiative process, called beta decay where a proton decays into neutron with the emission of a positron and a neutrino. And a free proton does not spontaneously decay (as far as all experiments have shown).

Also, at the macroscopic level, large material objects emit thermal electromagnetic waves, or thermal radiation. This is because again, the charged protons and electrons (in the atoms that make up a macroscopic object), are constantly vibrating. When these charged particles vibrate, since they are being rapidly accelerated and decelerated, they will emit these electromagnetic waves. Again, an acceleration of charged particles is required for the emission of electromagnetic waves.

Accelerating charged particles, electrons or protons, emit electromagnetic waves. This means if they are moving with a constant velocity, or they are stationary, they will not emit electromagnetic radiation (photons).

An electron in an atom (in an excited state) can emit a photon, and drops to a lower energy level. But a free, isolated, non-accelerating electron will not spontaneously emit a photon, because conservation of momentum/energy will not hold.

Also, a proton (in a nucleus) can go through a different radiative process, called beta decay where a proton decays into neutron with the emission of a positron and a neutrino. And a free proton does not spontaneously decay (as far as all experiments have shown).

Also, at the macroscopic level, large material objects emit thermal electromagnetic waves, or thermal radiation. This is because again, the charged protons and electrons (in the atoms that make up a macroscopic object), are constantly vibrating. When these charged particles vibrate, since they are being rapidly accelerated and decelerated, they will emit these electromagnetic waves. Again, an acceleration of charged particles is required for the emission of electromagnetic waves.

Accelerating charged particles, electrons or protons, emit electromagnetic waves. This means if they are moving with a constant velocity, or they are stationary, they will not emit electromagnetic radiation (photons).

An electron in an atom (in an excited state) can emit a photon, and drops to a lower energy level. But a free, isolated, non-accelerating electron will not spontaneously emit a photon, because conservation of momentum/energy will not hold.

Also, a proton (in a nucleus) can go through a different radiative process, called beta decay where a proton decays into neutron with the emission of a positron and a neutrino. And a free proton does not spontaneously decay (as far as all experiments have shown).

Accelerating charged particles, electrons or protons, emit electromagnetic waves. This means if they are moving with a constant velocity, or they are stationary, they will not emit electromagnetic radiation (photons).

An electron in an atom (in an excited state) can emit a photon, and drops to a lower energy level. But a free, isolated, non-accelerating electron will not spontaneously emit a photon, because conservation of momentum/energy will not hold.

Also, a proton (in a nucleus) can go through a different radiative process, called beta decay where a proton decays into neutron with the emission of a positron and a neutrino. And a free proton does not spontaneously decay (as far as all experiments have shown).

Also, at the macroscopic level, large material objects emit thermal electromagnetic waves, or thermal radiation. This is because again, the charged protons and electrons (in the atoms that make up a macroscopic object), are constantly vibrating. When these charged particles vibrate, since they are being rapidly accelerated and decelerated, they will emit these electromagnetic waves. Again, an acceleration of charged particles is required for the emission of electromagnetic waves.

Accelerating charged particles, electrons or protons, emit electromagnetic waves. This means if they are moving with a constant velocity, or they are stationary, they will not emit electromagnetic radiation (photons).

An electron in an atom (in an excited state) can emit a photon, and drops to a lower energy level. Also, a free electron can emit a photon, provided it absorbs one first (and the a photon is of the same amount of energy that it originally absorbed). But a free, isolated, non-accelerating electron will not spontaneously emit a photon, because conservation of momentum/energy will not hold.

Also, a proton (in a nucleus) can go through a different radiative process, called beta decay where a proton decays into neutron with the emission of a positron and a neutrino. And a free proton does not spontaneously decay (as far as all experiments have shown).

Accelerating charged particles, electrons or protons, emit electromagnetic waves. This means if they are moving with a constant velocity, or they are stationary, they will not emit electromagnetic radiation (photons).

An electron in an atom (in an excited state) can emit a photon, and drops to a lower energy level. But a free, isolated, non-accelerating electron will not spontaneously emit a photon, because conservation of momentum/energy will not hold.

Also, a proton (in a nucleus) can go through a different radiative process, called beta decay where a proton decays into neutron with the emission of a positron and a neutrino. And a free proton does not spontaneously decay (as far as all experiments have shown).