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  • curprev 11:2411:24, 16 March 2020 Bbtfan07 Message Wall contribs 1,076 bytes +238 Adding categories
  • curprev 11:2311:23, 16 March 2020 Bbtfan07 Message Wall contribs 838 bytes +838 Created page with "The “Doppler Effect” was first identified by Austrian physicist Christian Doppler in 1842. The phenomenon is the change in frequency of a moving object by a stationary obs..."