Period is 1/frequency
1/425 = 2.353ms
Multiplying the power of any signal by 5 can be described as
an increase of 6.99 dB .
If the whistle blew at 70 dB initially, and its sound power became
multiplied by 5, and the whistle and the listener both stayed in
the same places, then the listener would tell you that the whistle
was now blowing at 76.99 dB .
(More likely, he would report "77 dB" as he held his ears and winced.)
Addition of 2vector gives you 1large vector quantity
Actually moving and not. It is the sum of potential and kinetic energy.