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It would be extremely hard to notice any 'physical' signs because an electron is incredibly small, much, much smaller than an atom! So like Michael said, it's most likely that the detector can only detect the velocity of the ejected electrons. We know the mass of an electron experimentally = 9.11x10-31kg, so if we know an electron's velocity, we can calculate its kinetic energy. Obviously the converse is true as well: if we know the electron's kinetic energy, we can calculate its velocity.
You can't really measure "how fast" the kinetic energy of anything is. Kinetic energy is directly proportional to the velocity of the particle squared, so I guess you could say a physical sign of the kinetic energy of an ejected electron is the square root of its velocity.
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