blackbox emits EM wave i thought
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送交者: pgss 于 2014-04-09, 12:08:24:
回答: it is voice, machanical wave, not radio. 由 steven 于 2014-04-08, 14:11:35:
sound doppler is actually easier to detect because the shift depends on the ratio of source speed and the speed of the wave. speed of sound is a 1000 times slower, meaning dopppler more pronounced
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