Question

What is meant by the statement the frequency of tuning fork is 512 hz

Answer 1

it means that  the tuning fork vibrates 512 times in one second

Answer 2

A tuning fork of frequency 512 Hz is used to generate a standing wave pattern in a closed pipe, 0.850m long. A strong resonant note is heard indicating that an antinode is located                                                                                           at the open end of the pipe.                                                                                                                                                                                                               Frequency=512Hz                                                                                                 length=0.850m
 
 Hope it helps U