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A lightning detection network locates strokes by

  • A.measuring the thunder heard at the nearest station
  • B.detecting the charge left within the cloud immediately afterwards
  • C.timing the arrival of the radio pulse at several stations
  • D.photographing the flash from a single ground station

Answer: C

Time of arrival and direction finding at multiple sensors fix the position by triangulation. The electromagnetic pulse propagates for hundreds of kilometres, which gives such networks a wide reach. Sensor spacing of hundreds of kilometres is workable.

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