Question
Which decibel value most closely represents a power increase from 5 watts to 10 watts?
Answer Options
- A) 2 dB
- B) 3 dB
- C) 5 dB
- D) 10 dB
Correct Answer: B
Explanation
The decibel (\text{dB}) is a logarithmic unit used to express the ratio of two power levels. For power, the key relationship to memorize is that a 3\text{ dB} increase represents a doubling of power. Conversely, a -3\text{ dB} decrease represents halving the power.
Since the power is increasing from 5\text{ watts} to 10\text{ watts}, this is a doubling of power (10 / 5 = 2). Therefore, the change is exactly 3\text{ dB}. This relationship is a fundamental concept in amateur radio, often used to rate amplifiers or signal strength.
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