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175. DRAO is located in a basin surrounded by mountains, which shield it from manmade radio waves that interfere with astronomical signals. Manmade radio waves

175. DRAO is located in a basin surrounded by mountains, which shield it from manmade radio waves that interfere with astronomical signals. Manmade radio waves are produced by A. radioactive decay B. electron transitions in atoms C. oscillating charges in a linear antenna D. high speed electrons stopped suddenly by a metal surface

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