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Jun 21, 2012 at 18:15 comment added user1631 If the metal detector scans at 100 Khz, that's a wavelength of 3 kilometers. You're going to have a tough time getting any reasonable sized object to resonate for that frequency. The ski tag mentioned below is designed to resonate at 915 MHz, for comparison.
Jun 21, 2012 at 16:20 answer added Martin Beckett timeline score: 1
Jun 21, 2012 at 13:20 history asked NickG CC BY-SA 3.0