You're asking about the frequency of high C. There are actually a couple of ways to interpret "high C":

* High C on a piano: This is the C above middle C, often called C5. Its frequency is 523.25 Hz.

* High C on a violin: This can vary depending on the instrument and tuning. It is usually in the range of 1046 to 1048 Hz.

Hz stands for Hertz and represents the number of vibrations (or cycles) per second.

So, the answer to your question depends on which "high C" you're referring to!