The difference between the two frequencies at which the current is 0.707 of the maximum current value is the _____.

A) quality
B) power factor
C) bandwidth
D) resonance

The difference between the two frequencies at which the current is 0.707 of the maximum current value is known as the bandwidth. This is a common definition used in electronics and signal processing, particularly in the context of filters and resonance circuits, where it describes the range of frequencies over which the circuit or system operates effectively.