In the wikipedia article of the observable universe I have read the following:
"Both popular and professional research articles in cosmology often use the term "universe" to mean "observable universe". This can be justified on the grounds that we can never know anything by direct...
Okay, as I understand so far the wavelength (in a classical sense) influences the probability distribution of the wavefunction but is not the only factor of the spread of the wavefunction. What if an electron changes energy state and emits one photon. How does this photon spreads out? Spherical...
Okay I understand that, but then what tells us the wavelength at all what the frequency doesn´t already tells us, and how do we know if the wavelength is a "real" thing when it is completely independend from the spreading of the wave?
I´´m confused. How can a single photon in the lightspectrum with wavelength of a few hundert nanometers go through both slits in the double slit experiment at the same time. I understand the wave- particle duality and the concepts in principle. My confusion is in the context of little wavelength...