PG, take a tip and attach your pictures here in ETO rather than with an external image host.
What is a binary 0 and what is binary 1 depends entirely on the circuit.
It could be that a +ve voltage represents a "1" or it could represent "0".
Your diagrams show the waveform going +ve and -ve, this is usually not the case within equipment where +ve and 0v are used.
However the RS232 communications standard does use +ve and -ve voltages on the communications line.
Q1, what the 2 two units and 3 units repesent is meningless without knowing the context of the waveform.
Q2, it is incorrect to speak about wavelength in relation to a waveform like this. it would be correct to talk about units of time.
JimB