Fixed/standing wavelength

[705912349 Dis 1C]

Hi there. I was confused about what a fixed wavelength and a standing wavelength is. One of the achieve questions for weeks 2-4 involves choosing whether a wave pattern is compatible with de Broglie's description of the allowed Bohr orbits and I was wondering if we were supposed to apply an understanding of fixed and standing wavelength to this question.

[nicole_ershaghi 3F]

I don't believe that an understanding of fixed or standing wavelengths was required for the completion of the problem.

[Levy Shaked]

There must be an integer number of wavelengths in a wave function for a standing wave to be stable; otherwise, the electron standing wave around the atom will be discontinuous and there will be discontinuities in the probabilities of finding an electron particle at adjacent points. Wave functions thus must have a whole number of wavelengths, starting and ending at zero, ensuring that at the borders of the orbital (which encloses the space occupied by an electron), the probability of finding an electron is zero.