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Question 222

What dB change represents a factor of two increase or decrease in power?

  1. Approximately 2 dB
  2. Approximately 3 dBBonne réponse
  3. Approximately 6 dB
  4. Approximately 9 dB

Explication

Ten times the base-10 logarithm of a 2:1 power ratio is 3.01 dB, so doubling or halving power is about 3 dB. Approximately 6 dB corresponds to a factor of four in power, not two.

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Question 222: What dB change represents a factor of two increase or… · FCC General Class (Element 3) · Questena