21. The latest X86 chip, the Pentium 4, has 42 million transistors running at 3 billion cycles per second . 22. The brain stem contains a nucleus of cells that burst at a rate of 10 cycles per second . 23. At first, cells fire rhythmically at the extremely low rate of one to four cycles per second , Sejnowski said. 24. With an atomic clock, however, the oscillation frequency-- measured in billions of cycles per second -- is precise and unvarying. 25. The clock frequency ( cycles per second ) and the number of data transfers it performs per clock cycle. 26. The term " cycles per second " is usually referred to in science as hertz ( abbreviated Hz ). 27. Megahertz _ that is, millions of cycles per second _ is a measure of the speed of a microprocessor. 28. Humans can't react fast enough to keep the power pulsing at a steady 60 cycles per second of alternating current. 29. Intel's Pentium 4 processor clocks at speeds up to 1.7 gigahertz, which is more than a billion cycles per second . 30. A . Let's use as an example your trip to Russia, which uses 220 volts at 50 cycles per second .
