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.
We have a problem not only with a six-day creation, but also with the age of the earth. Is the earth a few thousand years old or billions of years old (as scientists today insist)? (p. 121) On a preliminary reading RC Sproul would appear to be non-committal about the age of the earth. Although the Bible clearly says that the world was created in six days, it gives no date for the beginning of the work. It would be a mistake to become embroiled in too much controversy about the date of creation. (p. 121)