What is the Air Force exchange rate (doubling rate)?

What is the Air Force exchange rate (doubling rate)?

• A. 3 dB
• B. 1 dB
• C. 5 dB
• D. 2 dB

Answer: (B)

The idea being tested is how exposure time changes as noise level changes, using what’s called the exchange rate or doubling rate. This rate is the amount of decibels you must move by to make the permissible exposure time double or halve. In Air Force practice, that increment is a single-decibel change. So a rise by that small step means the safe exposure window is cut in half, while a drop by that same step doubles the safe exposure window. That’s why the correct choice is the one that represents that single-decibel step. Other standards use larger steps, but Air Force uses this smallest unit, making it the right reference for the doubling rate.

The idea being tested is how exposure time changes as noise level changes, using what’s called the exchange rate or doubling rate. This rate is the amount of decibels you must move by to make the permissible exposure time double or halve. In Air Force practice, that increment is a single-decibel change. So a rise by that small step means the safe exposure window is cut in half, while a drop by that same step doubles the safe exposure window. That’s why the correct choice is the one that represents that single-decibel step. Other standards use larger steps, but Air Force uses this smallest unit, making it the right reference for the doubling rate.