According to the stated relation, the attenuation coefficient (dB/cm) equals the frequency (MHz) divided by 2. Which expression represents this coefficient?

According to the stated relation, the attenuation coefficient (dB/cm) equals the frequency (MHz) divided by 2. Which expression represents this coefficient?

• A. Frequency (MHz) divided by 2
• B. Frequency (MHz) multiplied by 2
• C. 1 divided by Frequency (MHz)
• D. Frequency (MHz) squared

Answer: (A)

The attenuation coefficient in dB/cm is tied to frequency by the simple relation α = f/2. This means the expression for the coefficient is frequency divided by 2, with f given in MHz. Since you’re dividing by a unitless number, the units stay as dB/cm. For example, if the frequency is 4 MHz, the coefficient is 4/2 = 2 dB/cm. Choosing any other form wouldn’t match α = f/2: multiplying by 2 would give 2f, the reciprocal would give 1/f, and squaring would yield f^2.

The attenuation coefficient in dB/cm is tied to frequency by the simple relation α = f/2. This means the expression for the coefficient is frequency divided by 2, with f given in MHz. Since you’re dividing by a unitless number, the units stay as dB/cm. For example, if the frequency is 4 MHz, the coefficient is 4/2 = 2 dB/cm. Choosing any other form wouldn’t match α = f/2: multiplying by 2 would give 2f, the reciprocal would give 1/f, and squaring would yield f^2.