[echonet]

I am doing some calculations of velocity based on wavelength and mass (using the formula v=h/(wm)) and I'm getting a different scientific notation exponent for each and every answer. Here are 2 examples (wavelength = 750 nm for both, or 7.50e-7)

Mass =  9.10939e-28 grams
     I get: 9.70e-1
     Book gets: 9.70e2

Mass = 1.67262e-24 grams
     I get: 5.29e-4
     Book gets: 5.29e-2


What am I doing wrong (this is somewhat urgent)?

Any help is VERY GREATLY appreciated!

[enahs]

What is the units in Planck's Constant? Are your units canceling?