Answer Posted / maddyavril

see we can t get the bandwidth of any amplifier u cn figure
it out wen u see a graph.so they (one who decided to use
half power point)to find the cut off freq because we need to
know about bandwidth for using it so cut off freq are needed
this cut off freq are get at 3 db point only.
y 3 db point?
is the q rite because we humans having percistence for
everything even for hearing and all we can able to sense the
change only wen the power gets at half power point . so it s
a got thearitically and kept for use 3 db point we can get
band width of amplifiers etc

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