Bohr’s Model; Matter Waves (Sections)The visible emission

Chapter , Problem 41E

(choose chapter or problem)

The visible emission lines observed by Balmer all involved $n_{f}=2$.

(a) Which of the following is the best explanation of why the lines with $n_{f}=3$ are not observed in the visible portion of the spectrum:

(i) Transitions to $n_{f}=3$ are not allowed to happen,

(ii) transitions to $n_{f}=3$ emit photons in the infrared portion of the spectrum,

(iii) transitions to $n_{f}=3$ emit photons in the ultraviolet portion of the spectrum, or

(iv) transitions to $n_{f}=3$ emit photons that are at exactly the same wavelengths as those to

$n_{f}=2$.

(b) Calculate the wavelengths of the first three lines in the Balmer series—those for which

$n_{i}=3,4, \text { and } 5$—and identify these lines in the emission spectrum shown in Figure 6.11.

Equation Transcription:

${n}_{f}=2$

${n}_{f}=3$

${n}_{f}=2$

${n}_{i}=3,4,\ and\ 5$

Text Transcription:

nf=2

nf=3

nf=2

ni=3,4, and 5

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