So the frequency is f =10 cycles / 120 s = 0.0833 cycles/s. Answer: D. Frequency refers to the number of occurrences of a periodic event per time and is measured in cycles/second. In this case, there are 10 cycles per 2 minutes (also known as 10 cycles per 120 seconds).
From the scientific viewpoint, the Earth would have had to form about 4.54 billion years since the earliest material in the solar system is dated back to about this time period.
Report Abuse. I would think that the moon is about as old as the earth, and would guess that to be about 4.5 billion years. However it is really difficult to document, as none of us where on earth at that time. They use carbon dating to document how much carbon is released from a rock after it is formed. So the 4.5 billion year estimate comes with a disclaimer. It might be off by 4.4 billion years younger, or many trillions of years older than we think it is.