Although photons and mechanical waves obey the same wave equation, the envelope of the electromagnetic field of a single photon propagating in vacuum is fixed and does not change with its propagation.
Although photons and mechanical waves follow the same fluctuating equations, the envelope of the electromagnetic field of a single photon transmitted in a vacuum is fixed and does not change with its propagation.
Although photon and mechanical wave follow the same wave equation, the envelope of electromagnetic field of a single photon propagating in vacuum is fixed and does not change with its propagation.