What is the value of energy
emitted when
electrons of 1g H-atom undergo transition giving
the spectral line of largest energy in the
visible region of
its atomic spectrum
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ANSWER
Formula used,
λ
1
=R[
n
1
2
1
−
n
2
2
1
]
R=1.109678×10
7
m
−1
, for visible region we have Balmer series.
For Balmer series, n
1
=2 and n
2
=3(for lowest energy)
Substituting values,
λ
1
=1.109678×10
7
[
2
2
1
−
3
2
1
]
⇒λ=6.546×10
−7
m
For energy formula is,
ΔE=
λ
hc
=
6.546×10
−7
6.62×10
−34
×3×10
8
=3.037×10
−19
J
Now energy emitted from 1.0 g of hydrogen atom (E
H
)=3.037×10
−19
×N
A
=3.037×10
−19
×6.02×10
23
=1.82×10
5
J
Hence, the correct option is A
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