Question

How do you convert 400 nm to wavenumber (cm-1)?

Answer 1

To convert a wavelength from nanometers (nm) to wavenumber in inverse centimeters (cm^-1), you can use the following formula:

Wavenumber (cm^-1) = 10^7 / Wavelength (nm)

Let's apply this formula to convert 400 nm to wavenumber:

Wavenumber (cm^-1) = 10^7 / 400 nm

Wavenumber (cm^-1) ≈ 25,000 cm^-1

Therefore, 400 nm is approximately equal to 25,000 cm^-1 when converted to wavenumber.