i have a question about the frequency of a wave. I thought it was measured in Hz but sometimes in the textbook it said it's measured in s-1 (-1 in superscript lol) are they both the same thing? but in one of the questions it asked to calculate the wavelength in the substance if the frequency is 1000s-1 and the speed of sound in the medium is 1230m/s If 1000s-1 is the same thing as 1000Hz, why do i get a wrong answer? I had to use 1000-1 (which is 0.001) to calculate this problem So what's the difference between the two???