DB meaning and definition.

[1] animations.physics.unsw.edu.au on DB


-3dB half, 3dB twice

In [33]: 10*math.log(10,10)
Out[33]: 10.0

In [34]: 10*math.log(2,10)           2 times
Out[34]: 3.0102999566398116          how 3 dB derived