Question

The wave number of an yellow radiation with wavelength 580 nm is

• A. \(1.724 \times 10^2 \text{ cm}^{-1}\)
• B. \(1.724 \times 10^4 \text{ cm}\)
• C. \(1.724 \times 10^3 \text{ cm}^{-1}\)
• D. \(1.724 \times 10^3 \text{ cm}\)
• E. \(1.724 \times 10^4 \text{ cm}^{-1}\)

Hint:

Check the units carefully.
Wave number must have units of \(\text{length}^{-1}\) (like \(\text{cm}^{-1}\)).
Options (B) and (D) are in \(\text{cm}\), so they can be eliminated immediately.

Answer 1

Answer: (E)