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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???