An apparent paradox: the Catt’s Anomaly

Catt’s anomaly is a sort of ‘thought experiment’ (a gedankenexperiment) where electrons seem to travel at the speed of light. Although its author argued with conviction for many years, it has a clear and satisfactory solution and it can be considered indubitably just an apparent paradox. Nevertheless, it is curious and very intriguing, and able to capture the attention of students.