finding frequency of light(simple physics)

[eax]

I got my answer but its not the same as the one in my book. My answer is 4.62*10^14 the book is same thing but *10^16. Heres the details

Wave length of 650nm is traveling through a vacuum(speed of light). what I did is took this formula

c(lightspeed = 3*10^8m/s)=l(wavelength)*f(frequency)

I did this

c(lightspeed = 3*10^8)=L(wavelength)*f(frequency)
---------------------------------------------------------------------
L

thus leaves with
c
-- = f
L

filling in the variables c is constant so I want bother with that
3*10^8
--------------- = f
650*10^-9(convert to m from nm)
what I got is f = 4.62*10^14


Am I right and the book is wrong. Because for all 4 questions the answer the book gives ends with 10^16 and I get 10^14.


Thank you for helping !

[dextercioby]

Your answer is correct.

Daniel.

[eax]

Thank you for you quick reply. The question(s) were driving me crazy.