text: the pendulum with the greatest frequency is the speed of sound is said to be? physics the highest frequency in empirical physics is the frequency of the electron rotating around the nucleus. however this is not the classic description of the pendulum. nor is the speed of sound. now.. if i actually knew what your question was i may be able to answer properly. your problem is your english is so poor you are not able to communicate properly. you should focus on english at school.. once you are able to communicate properly all your other questions will become very simple.