Physics Education

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Physics Education Volume 48 Number 6

M Pieraccini and S Selleri 2013 Phys. Educ. 48 718 doi:10.1088/0031-9120/48/6/718

An apparent paradox: Catt's anomaly

M Pieraccini and S Selleri

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massimiliano.pieraccini@unifi.it

Department of Information Engineering, University of Florence, Via Santa Marta, 3, I-50139 Firenze, Italy

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0031-9120/48/6/718

10.1088/0031-9120/48/6/718

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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.