I mean, say, the sun emits light waves towards us and those waves travel through vacuum at the speed of light, or
c. But does the sun emit those waves in every given moment? Or maybe, just maybe, the sun emits waves every certain fraction of a second, say every
10^-40 (just a random fraction) seconds a wave is emitted from the sun. Does the sun really ALWAYS emit waves? Or just in unnoticeable amounts of time? Is there any way to even test it? And if the emission rate is limited, is it equal with every light source?
Do we know of one? Do we know that such one doesn't exist? Is it even possible to know any of these?