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.
The Earth itself is 4.543 billion years old, while the moon itself is 4.53 billion years old. Because the earth itself was formed 4.6 billion years ago, which actually occurred since after the sun itself shone into life, and the moon itself was formed 4.5 billion years ago since after a Hypothetical planet (Which is Theia) struck the earth itself. Was this helpful?