Answer Posted / none

In electronics, cutoff frequency or corner frequency is the
frequency either above which or below which the power
output of a circuit, such as a line, amplifier, or
electronic filter is 1/2 the power of the passband.Because
power is proportional to the square of voltage, the voltage
signal is squere root of 1/2 of the passband voltage at the
corner frequency. Hence, the corner frequency is also known
as the −3 dB point because 1/2 is approximately −3
decibels. A bandpass circuit has two corner frequencies;
their geometric mean is called the center frequency.

Courtesy Wikipedia.

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