The supplied statement states that the sodium vapour lamp's volume is 20 LD torr.
From radio waves with wavelengths measured in meters to gamma rays with wavelengths shorter than around 1 1011 meters, electromagnetic radiation occurs throughout a very broad range of wavelengths.
Photons are bundles of something like the electromagnetic field which thus contain a set amount of energy and are the building blocks of light. You might count particles or even conduct measurements on something like a single photon using tests that are sensitive enough. Even light has been momentarily frozen by researchers.
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