Leslie Green asks:
Engineers need to use quantities which can vary over at least 30 orders of magnitude. Using zeros such as 12300000000000 is impractical. Engineering notation uses a number between 1 and just less than 1000 followed by a standard multiplier for thousands, millions, and so forth.
Express the frequency of 3 thousand million Hertz (Hz) in engineering notation.
3,000,000,000 Hz3 MHz3 GHz3 THz