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Not sure if this is the right place to ask this question, but anyways. I'm not very fond of circuits and stuff, but I've got a test question I really need to answer. The question is in the title, possible answer options are:

  • Fibrous surface
  • Temperature
  • Thermal conductivity
  • Velocity
  • Opacity
  • Average density
  • Color
  • Electromagnetic radio waves radiation (as far as I understand, the question suggests that we're speaking about waves produced by the object that we are measuring distance to itself)

Multiple choices are possible. I didn't manage to find an answer on the internet, so I hope someone can help me here.

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  • $\begingroup$ all of them depending what you are trying to measure... $\endgroup$ – Solar Mike Nov 18 '19 at 8:35
  • $\begingroup$ @SolarMike, apparently, I'm measuring distance to an object with an infrared Sharp sensor. And the deviations must be significant. Does this add more certainty? $\endgroup$ – Alex Chashin Nov 18 '19 at 8:38

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