12. What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1? (h = 6.626×10⁻³⁴ J·s) (A) 1.05 × 10⁷ m (B) 9.50 × 10⁻⁸ m (C) 2.09 × 10⁻¹⁸ m (D) 9.12 × 10⁻⁸ m (E) none of these

12. What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1? (h = 6.626×10⁻³⁴ J·s)
(A) 1.05 × 10⁷ m
(B) 9.50 × 10⁻⁸ m
(C) 2.09 × 10⁻¹⁸ m
(D) 9.12 × 10⁻⁸ m
(E) none of these

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統計： A(1), B(0), C(0), D(0), E(0) #4064110

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Jerry

B1 · 2026/10/15

#7589599

答案：B，9.50 × 10⁻⁸ m...

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22. The questions below refer to the following system: $$\text{Co}(\text{H}2\text{O}){6}^{2+} + 4 \text{Cl}^- \rightleftharpoons \text{CoCl}4^{2-} + 6\text{H}2\text{O}$$ When cobalt(II) chloride is added to pure water, the $\text{Co}^{2+}$ ions hydrate. The hydrated form then reacts with the $\text{Cl}^-$ ions to set up the equilibrium shown here. Which statement below describes the change that the system will undergo if silver nitrate is added? (A) It should become more blue. (B) It should become more pink. (C) Water will be produced. (D) The silver ion will react with the $\text{CoCl}_4^{2-}$. (E) Nothing will change.

12. What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1? (h = 6.626×10⁻³⁴ J·s)
(A) 1.05 × 10⁷ m
(B) 9.50 × 10⁻⁸ m
(C) 2.09 × 10⁻¹⁸ m
(D) 9.12 × 10⁻⁸ m
(E) none of these

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12. What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1? (h = 6.626×10⁻³⁴ J·s)(A) 1.05 × 10⁷ m(B) 9.50 × 10⁻⁸ m(C) 2.09 × 10⁻¹⁸ m(D) 9.12 × 10⁻⁸ m(E) none of these

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12. What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1? (h = 6.626×10⁻³⁴ J·s)
(A) 1.05 × 10⁷ m
(B) 9.50 × 10⁻⁸ m
(C) 2.09 × 10⁻¹⁸ m
(D) 9.12 × 10⁻⁸ m
(E) none of these