Does a digital binary number have any bandwidth? I explain suppose T want to express the number 10 in binary digits: 1 0 1 0 would that digital number have any BW in frequency domain? I would say the question has no meaning as frequency is the dual in time and a number 5 whether expressed in decimal or analog is not a quantity changing with time. am I right?
It's not meaningful, in my opinion, to talk of the "bandwidth" of a constant number. Unless you want to characterize that constant number as DC (because the value does not change in time). And the bandwidth of DC is zero.
But a stream of bits toggling on and off, yes, a bandwidth (which is the rate of change of the bits or "bitrate", if we're considering two-sided bandwidth or half the bitrate if we're considering the single-sided bandwidth) is meaningful.
In fact, a very important fundamental theorem from Claude Shannon relates bandwidth, signal-to-noise ratio, and rate of information together.
if you mean by right, is something scientifically true? by Popper, you can only show that it is false. The question if 5 has bandwidth needs to be refutable in order to be scientific.
It is refutable if 5 takes on a physical meaning like 3 bits transferred in 30 seconds.
If meaningful, the question of 5 has bandwidth without being refutable is a metaphysical question and truth is in a different context, than a scientific truth