It is micro (10 -12 )
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The metric prefix for billionth is nano- (symbol: n), representing 10^(-9).
I think you pico rather than pica. The prefix pico- represents a factor of 10-12, or 0.000 000 000 001. The next smallest prefix is femto- 10-15, or 0.000 000 000 000 001. Pico- is one step down from nano- which is 10-9, 0.000 000 001.
The Greek fractional prefix meaning one one-billionth is "nano-" (symbol: n).
The prefix for 1 billion is Giga. One billion Hertz is one gigahertz (GHz). So 2 billion is 2000 million which means 2 gigahertz (GHz) is 2000 megahertz (MHz). 1 GHz = 1000 kHz ll 3.525 MHz = 3525 kHz
0.000 000 1 = 100 x 10-9 = 100 nano Additional Information:-0.000 000 1 = 1.0*10-7 in scientific notation