Answer / shivani

Cutoff frequency is the frequency at which GAIN is reduced
to (1/2)^0.5 of its midband value.
And if we find the gain in dB then it will be equql to 3dB.
Gain(db) = 20log(1/1.41)=3dB

Answer / syncopator

The 3dB point is useful because it is the point at which
power is one half of the value within the passband of the
device being considered.

Answer / guru

Human ear can not distinguish between maximum and 3DB
frequency level. 3DB is maximum permitted level,more then
3DB results in noticeable change. It saves power.........

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