If the frequency doubles, what happens to the attenuation coefficient according to Attenuation coefficient (dB/cm) = Frequency (MHz)/2?

If the frequency doubles, what happens to the attenuation coefficient according to Attenuation coefficient (dB/cm) = Frequency (MHz)/2?

• A. It halves
• B. It quadruples
• C. It doubles
• D. It remains the same

Answer: (C)

Attenuation coefficient scales directly with frequency in this formula, since Attenuation = Frequency/2. When you double the frequency, you double the numerator, so the coefficient becomes twice as large. For example, at 3 MHz the coefficient is 1.5 dB/cm; at 6 MHz it’s 3 dB/cm, doubling the value. The other possibilities don’t fit because halving would imply inverse dependence, quadrupling would require four times the frequency, and staying the same would ignore the frequency term altogether.

Attenuation coefficient scales directly with frequency in this formula, since Attenuation = Frequency/2. When you double the frequency, you double the numerator, so the coefficient becomes twice as large. For example, at 3 MHz the coefficient is 1.5 dB/cm; at 6 MHz it’s 3 dB/cm, doubling the value. The other possibilities don’t fit because halving would imply inverse dependence, quadrupling would require four times the frequency, and staying the same would ignore the frequency term altogether.