Feet and inches or millimeters or centimeters or meters or miles or kilometers
Answer:
N
Explanation:
Using the formula you gave:

In Electromagnetic spectrum, X-rays has very high frequency but gamma-rays has more than that. If you consider cosmic rays as an electromagnetic wave, then it would be highest energetic and has highest frequency.
In short, Your Answer is "Cosmic rays"
Hope this helps!
the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion.