In the Rydberg formula 1/λ = R(1/n₁² − 1/n₂²), the constant R is the ___ constant:

In the Rydberg formula 1/λ = R(1/n₁² −…

Answer: Rydberg.

A Rydberg
B Planck
C Boltzmann
D gravitational

Correct answer: A. Rydberg

Explanation: R is the Rydberg constant, about 1.097 × 10⁷ m⁻¹.

Comparison of the Thomson model and the Rutherford model of the atom: in the Thomson plum pudding model alpha particles pass almost straight through a diffuse positive sphere, while in the Rutherford model a concentrated central nucleus deflects some alpha particles through large angles, with the lower panels showing the alpha particle source and gold foil and the observed result of wide-angle scattering

The Geiger–Marsden alpha-scattering result: a few alpha particles bounce back at large angles, which rules out Thomson’s diffuse model and demands a tiny, massive, positively charged nucleus. Image: Kurzon, CC BY 3.0, via Wikimedia Commons.

Concept context

Thomson's plum-pudding model, Rutherford's nuclear model from alpha-scattering, Bohr's postulates and hydrogen spectrum, spectral series (Lyman to Pfund), Rydberg formula, and limitations of each model.

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In the Rydberg formula 1/λ = R(1/n₁² − 1/n₂²), the constant R is the ___ constant:

Concept context

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