Physics Wallah is an Indian edtech platform that provides accessible & comprehensive learning experiences to students from Class 6th to postgraduate level. We also provide extensive NCERT solutions, sample paper, NEET, JEE Mains, BITSAT previous year papers & more such resources to students. Physics Wallah also caters to over 3.5 million registered students and over 78 lakh+ Youtube subscribers with 4.8 rating on its app.
We Stand Out because
We provide students with intensive courses with India’s qualified & experienced faculties & mentors. PW strives to make the learning experience comprehensive and accessible for students of all sections of society. We believe in empowering every single student who couldn't dream of a good career in engineering and medical field earlier.
Our Key Focus Areas
Physics Wallah's main focus is to make the learning experience as economical as possible for all students. With our affordable courses like Lakshya, Udaan and Arjuna and many others, we have been able to provide a platform for lakhs of aspirants. From providing Chemistry, Maths, Physics formula to giving e-books of eminent authors like RD Sharma, RS Aggarwal and Lakhmir Singh, PW focuses on every single student's need for preparation.
What Makes Us Different
Physics Wallah strives to develop a comprehensive pedagogical structure for students, where they get a state-of-the-art learning experience with study material and resources. Apart from catering students preparing for JEE Mains and NEET, PW also provides study material for each state board like Uttar Pradesh, Bihar, and others
Ans. The emission spectrum of hydrogen is a series of coloured lines produced when hydrogen gas is excited and then emits light as it returns to its ground state. Each line in the spectrum corresponds to a specific wavelength of light associated with the energy transitions of hydrogen atoms.
Q.2 : What is a line spectrum?
Ans. A line spectrum is a pattern of distinct lines or bands of light produced when an element emits or absorbs energy. Each line in the spectrum corresponds to a specific wavelength of light associated with a particular energy transition within the atom or molecule.
Q.3 : What is the Balmer series in the hydrogen spectrum?
Ans. The Balmer series is a specific set of spectral lines observed in the visible region of the hydrogen spectrum. These lines are produced when hydrogen atoms transition from higher energy levels to the second energy level (n = 2). The Balmer series includes several prominent lines, such as H-alpha, H-beta, H-gamma, and so on, each corresponding to a specific wavelength of light.
Line Spectrum Of Hydrogen In Chemistry, Types Of Series, Important Topics For JEE 2025
Line Spectrum Of Hydrogen : Explore the line spectrum of hydrogen in chemistry, revealing discrete wavelengths emitted or absorbed during electron transitions, pivotal in atomic structure elucidation and spectroscopy.
Shrivastav 25 Jun, 2024
Share
Line Spectrum Of Hydrogen :
Hey there, young scientists! Have you ever wondered what makes up the colourful lights we see in fireworks or neon signs? Or why do certain elements emit specific colours of light when heated or excited? Well, get ready to uncover the mysteries of hydrogen– the simplest and most abundant element in the universe – and its fascinating emission and line spectrum. In this article, we'll embark on an illuminating journey to understand how hydrogen atoms emit light and produce unique spectral lines, all explained in simple terms just for you.
Emission Spectrum Of Hydrogen
Let's start by unravelling the concept of the emission spectrum. Imagine you have a special flashlight that shines light through a prism. When you shine the light through the prism, it breaks up into a rainbow of colours – just like a rainbow in the sky after it rains! This rainbow of colors is called a spectrum. Now, if we're talking about the emission spectrum, it means we're looking at the specific colours of light emitted by a substance when it's excited or heated.
In the case of hydrogen, when we heat it or run an electric current through it, the hydrogen atoms get excited and emit light. But here's the cool part – the light emitted by hydrogen isn't just a random mishmash of colours. Instead, it produces a series of distinct lines of light at specific wavelengths, creating what we call an emission spectrum.
Line Spectrum of Hydrogen
Line Spectrum of Hydrogen :
Line spectrum of hydrogen is observed due to excitation or de-exicitation of electron from one stationary orbit to another stationary orbit.
Let electron make transition from
n
2
to
n
1
(
n
2
>
n
1
) in a H-like sample
Energy of emitted photon =
Wavelength of emitted photon
Wave number,
R = Rydberg constant = 1.09678 × 10
7
m
–1
Series
Discovered by
Regions
n
2
n
1
Lyman
Lyman
U.V. region
n
2
= 2, 3, 4…
n
1
= 1
Balmer
Balmer
Visible region
n
2
= 3, 4, 5…
n
1
= 2
Paschen
Paschen
Infra red (I.R.)
n
2
= 4, 5, 6…
n
1
= 3
Brackett
Brackett
I.R. region
n
2
= 5, 6, 7…
n
1
= 4
Pfund
Pfund
I.R. region
n
2
= 6, 7, 8…
n
1
= 5
Humphery
Humphery
Far I.R. region
n
2
= 7, 8, 9…
n
1
= 6
Spectra Lines Of Hydrogen Atom
Lyman series
It is first spectral series of H.
It was found to be in
ultraviolet region
by Lyman in 1898.
For it value of n
1
= 1 and n
2
= 2, 3, 4 where ‘n
1
’ is ground state and ‘n
2
’ is called excited state of electron present in a H-atom.
where n
2
> 1 always.
The wavelength of marginal line (i.e. n
2
= ∞) =
for all series. So for lyman series
I
st
line of lyman series
=
2 → 1
II
nd
line of lyman series = 3 → 1
Last line of lyman series = ∞ → 1
[10.2 eV ≤ (ΔE)
lyman
≤ 13.6eV]
Balmer series
It is the second series of H-spectrum.
It was found to be in
visible region
by Balmer in 1892.
For it value of n
1
= 2 and n
2
= 3, 4, 5, …
The wavelength of marginal line of Balmer series =
where n
2
> 2 always.
1.9 ≤ (ΔE)
balmer
≤ 3.4 eV.
Paschen series
It is the third series of H - spectrum.
It was found to be in
infrared region
by Paschen.
For it value of n
1
= 3 and n
2
= 4, 5, 6……..
The wavelength of marginal line of Paschen series =
where n
2
> 3 always.
Brackett series
It is fourth series of H - spectrum.
It was found to be in
infrared region
by Brackett.
For it value of n
1
= 4 and n
2
= 5, 6, 7 …
The wavelength of marginal line of brackett series =
where n
2
> 4 always.
Pfund series
It is fifth series of H - spectrum.
It was found to be in
infrared region
by Pfund.
For it value of n
1
= 5 and n
2
= 6, 7, 8……. where n
1
is ground state and n
2
is excited state.
The wavelength of marginal line of Pfund series =
where n
2
> 5 always.
Humphry series
It is the sixth series of H-spectrum.
It was found to be in
infrared region
by Humphry.
For it value of n
1
= 6 and n
2
= 7, 8, 9
The wavelength of marginal line of Humphry series =
where n
2
> 6.
Spectrum Of Hydrogen Solved Example
Q.1 :
In the spectrum of He
+
ion the wavelength of
line of Balamer series is
x
Å. What is the wavelength of
line of Brackett series.
Sol :
Q.2 :
A sample of He
+
ions in ground state absorbs the radiation of
x
Å. Subsequently, The sample emit radiation of 6 different wavelength. Calculate the value of
x
.
Sol :
Q.3 :
In a hydrogen spectrum if electron moves from 6
th
to 2
nd
by transition in multi steps then find out the number of lines in spectrum.
Sol :
Total number of lines = 4 + 3 + 2 + 1 + 0 = 10
Total number of lines =
Talk to a counsellorHave doubts? Our support team will be happy to assist you!
