What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?

To find the total bandwidth of an FM (Frequency Modulation) signal, you must use Carson's Rule. The formula is: Bandwidth = 2 × (peak frequency deviation + highest modulating frequency). In this question, the peak deviation is given as 5 kHz, and the modulating frequency is 3 kHz. First, add the two values together: 5 kHz + 3 kHz = 8 kHz. Next, multiply that sum by 2 to account for both sides of the carrier wave. 8 kHz × 2 = 16 kHz total bandwidth. Distractors like 8 kHz are the result of forgetting the multiplier, while 3 kHz and 5 kHz are just the raw variables.