ImPACT is the most-widely used and most scientifically validated computerized concussion evaluation system. Many teams and organizations around the world trust ImPACT for concussion management. An estimated 4 to 5 million concussions occur annually, with increases emerging among middle school athletes.
Horizontal logarithmic scale marked with units of time. A millisecond (from milli-and second; symbol: ms) is a thousandth (0.001 or 10 â3 or 1 / 1,000) of a second. 10 milliseconds (a hundredth of a second) are called a centisecond. 100 milliseconds (one tenth of a second) are called a decisecond. To help compare orders of magnitude of different times, this page lists times between 10â3 seconds and 10 0 seconds (1 milli second and one second). See also times of other orders of magnitude.
A nanosecond is equal to 1000 picoseconds or 1â1000 microsecond. Because the next SI unit is 1000 times larger, times of 10 â8 and 10 â7 seconds are typically expressed as tens or hundreds of nanoseconds.Times of this magnitude are commonly encountered in telecommunications, pulsed lasers and some areas of electronics. 1.0 nanosecond â cycle time for radio frequency 1 GHz (1 Ã 10 hertz), an inverse unit. 2  This corresponds to a radio wavelength of 1 light-nanosecond or 0.3 m, as can be calculated by multiplying 1 ns by the speed of light (approximately 3 Ã 10 m/s) to determine the distance traveled.