Scientists of the 19th Century found that the equation, 1/ l = R_H(1/n²₁ - 1/n²₂) (where R_H = 1.097×10⁷ m^{- 1}, and n₁ and n₂ are whole numbers) predicts the wavelength of the lines in the emission spectrum of the H atom. This equation is properly referred to as:

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The equation given is known as the Rydberg formula, which was developed by Johann Rydberg in the late 19th century. It is considered a law because it accurately predicts the wavelengths of the spectral lines in hydrogen emission. Laws are scientific principles or observations that have been repeatedly tested and proven to hold true under a certain set of conditions.

Scientists of the 19th Century Found That the Equation, 1