Question

What do u mean by the statement frequency of sound is 512hz

Answer 1

The audible frequency varies from 20 to 20000 Hz.​​​​That is a sound with low frequency will be having low pitch and a sound with high frequency will be having high pitch nature.

I hope your question is about the tuning fork that produces 512 Hz.It actually means that the tuning fork vibrates 512 times in one second.

Hope this helps :)