Help with a diffraction grating problem

[buttermilkxxx]

Homework Statement

Monochromatic light illuminates a diffraction grating having 5950 lines/cm. The diffraction angle for the first order image is 18 degrees. what is the wavelength in nm

Homework Equations

wavelength=D * Sin(Theta

The Attempt at a Solution

So I know theta is 18, and the D is cm over lines so you have to flip 5950 to 1/5950. What I don't know is does this need to be in nm, or can you leave it in cm. Please explain how to do this for me. Thanks in advance

 

[Doc Al]

All distances had better be in the same units. Since you want the wavelength in nm, express D in terms of nm. 1 cm = 10^-2 m; 1 nm = 10^-9 m. So 1 cm equals how many nm?

 

[FizixFreak]

Have you access to the answer
is it 0.520nm?

 

[FizixFreak]

Actually it would be right even if you divide the answer of 1/5950 by hundred to get d in meters then convert the answer to nm