Ok I need help, I have a take home quiz and one of the questions on the quiz is:

6. Hertz is the measure of ____________________ per ______________________.

I think its one cycle per sound, but im not sure so help me?
yupppppp its a measure of frequency, so it's the measure of a repetition: cycles per second in units of Hz or s^-1
Yeah type i mean second not sound, but yeah i think its right, just wanted to make sure.