what is the use of -3 db frequency?& why does it exist in filters?

what is the use of -3 db frequency?& why does it exist in
filters?

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what is the use of -3 db frequency?& why does it exist in filters?..

Answer / mohit

-3 db in filters are use for bandwidth measurement. the 3db is the marking in logarithmic graph used to measure the B.W.

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