Photoelectric Effect and Line Spectra (4E)
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QUESTION
Which hydrogen series corresponds to transitions ending at
n
f
=
1
n_f=1
n
f
=
1
?
QUESTION
Which quantity must exceed the work function
ϕ
\phi
ϕ
for photoemission to occur?
QUESTION
State the formula for photon energy emitted or absorbed for a hydrogen transition
n
i
→
n
f
n_i\to n_f
n
i
→
n
f
.
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ANSWER
Δ
E
=
13.6
eV
(
1
n
f
2
−
1
n
i
2
)
\Delta E=13.6\ \text{eV}\left(\frac{1}{n_f^2}-\frac{1}{n_i^2}\right)
Δ
E
=
13.6
eV
(
n
f
2
1
−
n
i
2
1
)
. Energy difference between levels determines photon energy in transitions, positive for emission when
n
i
>
n
f
n_i>n_f
n
i
>
n
f
.
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