feynmanism
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In quantum mechanics lab our frequency meter shows ~50 Hz when it is plugged into a device which is not turned on. Is this a problem or an effect that I don't know? 
The frequency meter in the quantum mechanics lab displays approximately 50 Hz when connected to an inactive device, indicating it is likely detecting the mains frequency, which is typically 50 Hz. This phenomenon is common among frequency detection devices, as they often incorporate 50 Hz and 100 Hz narrowband band-stop filters to mitigate interference from electrical noise. Understanding this behavior is crucial for accurate measurements in quantum experiments.
PREREQUISITESQuantum physicists, laboratory technicians, and anyone involved in experimental physics who seeks to understand the implications of frequency detection in quantum mechanics.