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: \( \boxed{\text{Rydberg constant}} \).
In the Carius method of estimation of halogen, 0.4g of an organic compound gave 0.188g of AgBr. What is the percentage of bromine in the organic compound? (The atomic mass of Ag = 108 g mol\(^{-1}\) & Br = 80 g mol\(^{-1}\))
For the reaction:
\[ 2A + B \rightarrow 2C + D \]
The following kinetic data were obtained for three different experiments performed at the same temperature:
\[ \begin{array}{|c|c|c|c|} \hline \text{Experiment} & [A]_0 \, (\text{M}) & [B]_0 \, (\text{M}) & \text{Initial rate} \, (\text{M/s}) \\ \hline I & 0.10 & 0.10 & 0.10 \\ II & 0.20 & 0.10 & 0.40 \\ III & 0.20 & 0.20 & 0.40 \\ \hline \end{array} \]
The total order and order in [B] for the reaction are respectively: