If the average wavelength is 69.9cm and the frequency is 512 Hz, what is the speed of sound?

Question

I understand that the formula is:

velocity = frequency x wavelength

But why does 69.9 cm become 0.699? Why do we divide it by 100?

Answer 1

Here's something you should try using . . . units.

v = (512/s)*69.9cm = 35789cm/s

Answer 2

You divide it by 100 because speed is generally measured in Meters per Second, and a centimeter is 1/100th of a meter.