Attenuation is measured in which unit?

Attenuation is measured in which unit?

• A. Decibels
• B. Watts
• C. Hertz
• D. Pascals

Answer: (A)

Attenuation is the reduction of signal strength, and we quantify that loss with decibels because the decibel is a logarithmic unit that expresses ratios of power or amplitude. Using decibels lets us compare large decreases in a compact form: attenuation in terms of power is 10 log10(Pout/Pin), and for voltage or current with a fixed impedance it’s 20 log10(Vout/Vin). This scale lines up with how we experience changes in loudness and how signals degrade across components. Watts would tell you the absolute power, not the amount of loss; Hertz is frequency, and Pascals measure sound pressure. So decibels is the appropriate unit.

Attenuation is the reduction of signal strength, and we quantify that loss with decibels because the decibel is a logarithmic unit that expresses ratios of power or amplitude. Using decibels lets us compare large decreases in a compact form: attenuation in terms of power is 10 log10(Pout/Pin), and for voltage or current with a fixed impedance it’s 20 log10(Vout/Vin). This scale lines up with how we experience changes in loudness and how signals degrade across components. Watts would tell you the absolute power, not the amount of loss; Hertz is frequency, and Pascals measure sound pressure. So decibels is the appropriate unit.