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For that same design, sending once a second instead would raise the radio's contribution to about

  • A.1.7 \( \mu \)W
  • B.10 \( \mu \)W
  • C.1 mW
  • D.100 \( \mu \)W

Answer: D

A hundred microjoules every second is a hundred microwatts, sixty times the previous figure and now certainly the dominant term. Reporting interval is therefore the single most powerful lever in a wireless sensor's energy budget.

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