【简答题】An FM radio transmitter has a power output of 100 kW and operates at a frequency of 94 MHz. The energy of a photons is __________________. How many photons per second does the transmitter emit? ______...
【单选题】The primary AC system is a three-phase, four-wire, wye connected system that operates at a voltage of 115/200V AC, a frequency of 400Hz and is rated at 90kVA. choose the wrong answer:
【简答题】HOW TO READ A COMPUTER AD. 1 The main processing chip called a 'Pentium 4' that was designed and manufactured by the Intel Corporation. It operates at a clock speed of three gigahertz and has a front-...