The Rydberg constant is a fundamental physical constant related to the hydrogen atom's energy levels. The Rydberg constant has units of \( \text{cm}^{-1} \), and it is used to describe the wavelengths of spectral lines of hydrogen.
Thus, the constant that has units of \( \text{cm}^{-1} \) is the Rydberg constant.
Thus, the correct answer is: \( \boxed{\text{Rydberg constant}} \).
ΔS would be negative for which of the following reactions?
(I) \( {CaCO}_3(s) \rightarrow {CaO}(s) + {CO}_2(g) \)
(II) \( {Ag}^+(aq) + {Cl}^-(aq) \rightarrow {AgCl}(s) \)
(III) \( {N}_2(g) + 3{H}_2(g) \rightarrow 2{NH}_3(g) \)
Choose the correct answer from the codes given below:
Kepler's second law (law of areas) of planetary motion leads to law of conservation of