In general:-

Code:
               speed of light (m/s)
  Frequency  = --------------------  Hz
                  wavelength (m)
                       
                        1
  Period     = --------------------  s
                  frequency (Hz)

               speed of light (m/s)
  Wavelength = --------------------  m
                  frequency (Hz)
                  
  ...where the speed of light is 2.998E+8 m/s
  (for most calculations 3E+8 is close enough)
  (notice that this is 300,000 km/s)

You could say that a heart rate of 60 BPM is 1 Hz (that is, 1 beat per second) ... 120 BPM 2 Hz, etc. But that would be an unusual choice of terminology (in the clinical context). smile

If you don't inspect ... don't expect.