Real photons do have frequencies, which is directly related to its energy. So, can virtual photons that take part in EM interactions have frequencies too?
When my hand is pressed up against a glass window, do the virtual photons taking part in the EM interaction keeping my hand from falling through the window have a frequency compared to the photons that passing through the window (visible spectrum) or those reflecting off it (frequencies the glass is opaque to)?
Also, since virtual photons may be massive and definitely have four-momentum, they definitely do have some energy - so is there any notion of frequency?
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