No, electrons do not have a fixed frequency or wavelength. The concepts of frequency and wavelength are typically associated with electromagnetic waves, such as light, rather than particles like electrons.
However, electrons can exhibit wave-like behavior under certain circumstances, as described by quantum mechanics. This behavior is described by a mathematical function called a wavefunction, which includes properties like frequency and wavelength. The wavefunction of an electron can be used to calculate probabilities of finding the electron at different locations.
In this context, the frequency and wavelength associated with an electron are related to the de Broglie wavelength, which is given by the equation λ = h/p, where λ is the wavelength, h is the Planck constant, and p is the momentum of the electron. The de Broglie wavelength represents the wave-like nature of a particle, including an electron, and it is inversely proportional to the momentum of the particle.
Since electrons can have different momenta depending on their energy and velocity, the de Broglie wavelength and associated frequency can vary for different electrons. So, in general, not all electrons have the same frequency and wavelength.