I was very confused some says its the speed how fast your computer can executes your program, but computer executes every thing in cycles. After some google i found the answer.
We know speed of light
299 792 458 meters / second
1 meter = 100 centimeter
1 nanosecond = 1/1000000000 seconds
distance traveled by light in one nanosecond would be around
29.9 792 458 cm
2.5 GHz = 2.5 billion cycles per second
i.e 2.5 billion equals to 2500000000 cycles per second
when we talk in nano seconds it comes 2.5 cycles in 1 nano seconds
1 nano = 29.9 792 458 cm in term of light
1 nano = 2.5 cpu cycles
when we compare cpu cycle with distance traveled by light
1 cycle = 29.972458/2.5 = 11.9889832 cm
so cpu completes one cycle when the light travels only 11.9889832 cm
Imagine......:-)
