The document discusses the hydrogen spectral series, which consists of a sequence of spectral emissions arranged by wavelength. The series occur in the ultraviolet, visible, and infrared regions. Experimentally, hydrogen gas in a discharge tube is excited by a stream of electrons from a cathode. This causes electrons in hydrogen atoms to absorb energy and jump to higher energy orbits. When the electrons fall back down, they emit photons of specific wavelengths, producing the spectral lines. There are six hydrogen spectral series named after their discoverers - Lyman, Balmer, Paschen, Brackett, Pfund, and Humphreys. The Rydberg formula can be used to calculate the wavelengths of lines in the series based on the energy levels involved.
Consider a sample of hydrogen gas in the glass discharge tube. The electric current is passed through the hydrogen gas present in the discharge tube under low pressure. When the hydrogen atoms absorb energy from the electric discharge, they get excited to higher energy states. And the unsettled electron in the excited state then returns to its initial position with the emission of photons of suitable wavelengths.
Now, the hydrogen gas in the discharge tube glows red indicating, the electron transition between the two different energy levels. And the emitted light radiation is passed through the slit and made to fall on the glass prism that separates the light radiation into constituent wavelengths. Finally, the photographic plate placed over there records the line emission spectrum of hydrogen.
The spectrum contains a set of lines in the ultraviolet, visible, and infrared regions. And the wavelength of lines obtained below 400 nm falls in the ultraviolet part of the electromagnetic spectrum. Similarly, wavelengths of lines obtained above 700 nm are in the infrared zone. The spectral lines in the visible region have wavelengths between 400-700 nm. The different wavelengths of light energy produced by hydrogen atoms are also known as the hydrogen light spectrum.
Consider a sample of hydrogen gas in the glass discharge tube. The electric current is passed through the hydrogen gas present in the discharge tube under low pressure. When the hydrogen atoms absorb energy from the electric discharge, they get excited to higher energy states. And the unsettled electron in the excited state then returns to its initial position with the emission of photons of suitable wavelengths.
Now, the hydrogen gas in the discharge tube glows red indicating, the electron transition between the two different energy levels. And the emitted light radiation is passed through the slit and made to fall on the glass prism that separates the light radiation into constituent wavelengths. Finally, the photographic plate placed over there records the line emission spectrum of hydrogen.
The spectrum contains a set of lines in the ultraviolet, visible, and infrared regions. And the wavelength of lines obtained below 400 nm falls in the ultraviolet part of the electromagnetic spectrum. Similarly, wavelengths of lines obtained above 700 nm are in the infrared zone. The spectral lines in the visible region have wavelengths between 400-700 nm. The different wavelengths of light energy produced by hydrogen atoms are also known as the hydrogen light spectrum.
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Along with their physical and chemical properties are also shown. Helpful for quick understanding on lanthanide series.
The shortest and longest wavelengths of the hydrogen spectral seriesSaiKalyani11
The hydrogen spectrum has six series. They are Lyman series, Balmer series, Paschen series, Brackett series, Pfund series, and Humphreys series.
This presentation discusses the longest and shortest wavelengths of spectral lines that occur in all the six series of the hydrogen spectrum.
Name the series of the hydrogen spectrumSaiKalyani11
The hydrogen spectrum has six series named by the scientists who discovered them. They are the sequence of spectral emissions arranged based on their wavelengths in the electromagnetic region of the hydrogen atomic spectrum. The names of those six hydrogen spectrum series are;
Lyman series
Balmer series
Paschen series
Brackett series
Pfund series
Humphrey’s series
this presentation discusses the crystal field theory and its role in explaining the formation of coordination complexes by transition elements, their magnetic and colour properties; and its limitations!
A brief introduction to lanthanide elements is given.
Order .ppts like this at <https://www.fiverr.com/anikmal/teamup-with-you-to-prepare-the-best-presentation>
Along with their physical and chemical properties are also shown. Helpful for quick understanding on lanthanide series.
The shortest and longest wavelengths of the hydrogen spectral seriesSaiKalyani11
The hydrogen spectrum has six series. They are Lyman series, Balmer series, Paschen series, Brackett series, Pfund series, and Humphreys series.
This presentation discusses the longest and shortest wavelengths of spectral lines that occur in all the six series of the hydrogen spectrum.
Name the series of the hydrogen spectrumSaiKalyani11
The hydrogen spectrum has six series named by the scientists who discovered them. They are the sequence of spectral emissions arranged based on their wavelengths in the electromagnetic region of the hydrogen atomic spectrum. The names of those six hydrogen spectrum series are;
Lyman series
Balmer series
Paschen series
Brackett series
Pfund series
Humphrey’s series
The Balmer series of the hydrogen spectrumSaiKalyani11
Balmer is well renowned for his research on the hydrogen spectral series. The part of the hydrogen emission spectrum that corresponds to electron transitions from higher orbicular states n>2 to the energy level with principal quantum number n=2 is a series of spectral lines known as the Balmer series. And the Balmer series consists of a sequence of spectral emissions in both ultraviolet and visible regions of the electromagnetic spectrum.
Structure of Atoms some basic concepts of atomic structure its history of modelling and also the present and accepted model including the quantum model of atomic structure.
The hydrogen fine structure, results from the influence of the intrinsic electromagnetic force of the atom with the photons. It involves the interaction of quantum mechanical spin with the electron's orbital motion.
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Introduction
Discovery of Sub-atomic Particles
Atomic Models
Developments leading to Bohr’s Model of atom
Bohr’s Model for Hydrogen atom
Quantum Mechanical Model of the atoms
If everyone is thinking alike, we cannot solve the hurdles of a problem. It seems true if we observe these hypotheses' hierarchy once. Italian physicist Francesco Maria Grimaldi discovered the wave phenomenon of light in 1665. But the uncertainty about light's nature was finally solved by Einstein's explanation of the photoelectric effect. Similarly, Neil Bohr succeeded in describing the structure of an atom with quantized electron orbits. But his stipulation of allowed stationary orbits was only a supposition until the discovery of the de-Broglie equation.
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The blackbody is a hollow enclosure with a pinhole to emit its radiations. The secure covering of the blackbody prevents the absorbed light from escaping.
A blackbody is a solid closed unreal body that is inexistent. But lamp black, platinum black, and graphite-coated surfaces are non-ideal black bodies for laboratory purposes. An object with above 0.95 emissivities is an approximate blackbody. Besides, the hotter bodies emitting electromagnetic radiation under thermal equilibrium conditions are also considered partial black bodies.
An ideal black body is an imaginary perception of Gustav Kirchhoff that played a significant role in the development of quantum mechanics. Every object in the universe absorbs and emits electromagnetic energy to a certain extent under favorable conditions. But a black body absorbs all the electromagnetic radiation falling on it without limit from all directions. Consequently, it is black.
MCQs of blackbody & Kirchhoff's law.pdfSaiKalyani11
It is a PowerPoint presentation on multiple choice questions and answers on Blackbody & Kirchhoff's law topics. It discusses all practical examples and numerical problems of the said concepts.
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It is a PowerPoint presentation of Kirchhoff's law of thermal radiation. And it gives a brief idea of Kirchhoff's law, its applications, and examples. Moreover, it explains the terms absorptivity, emissive power, thermal equilibrium, and emissivity.
It discusses Kirchhoff's law and its examples. It explains blackbody emissions in thermal equilibrium conditions.
We are sorry to inform you about a small error in Kirchhoff's formula section of the above infographic. Kirchhoff's formula states that the absorptivity and emissivity of the body are equal in thermal equilibrium conditions. 'a' is the absorbing power of the body at a wavelength λ. And 'e' is the emissivity of the body at the same wavelength. So, we will write aλ=e but not aλ=eλ. We request you read it correctly while going through the PDF.
Kirchhoff's law formula and its derivation. Numerical problems.pdfSaiKalyani11
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It describes the definition of Planck's constant. Planck constant helps compute the discrete energy changes of a body by relating to the frequency of the photon. Planck constant explains the proportionality relationship between the photon's energy and the frequency.
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The Rydberg formula helps to determine the wavenumber or wavelengths of hydrogen spectral lines obtained in the hydrogen spectrum. Previously, Johann Jakob Balmer discovered an empirical formula to determine the wavelengths of hydrogen spectral lines obtained in the visible region of the hydrogen spectrum. As we all know, the hydrogen spectrum is not limited to the visible zone only. It occupies the ultraviolet and infrared parts of the electromagnetic spectrum also. Hence, the scientists' quests to determine the spectral positions of various spectral lines of the hydrogen spectrum finally came to an end with the Rydberg formula.
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2. Hydrogen spectral series
The hydrogen spectral series consists of a sequence of spectral emissions
arranged based on their wavelengths in the electromagnetic region of the
hydrogen atomic spectrum.
These are the series of distinct and discrete spectral lines in the ultraviolet,
visible, and infrared regions of the electromagnetic spectrum.
Jayam chemistry learners
3. Hydrogen spectral series
• Experimentally, the discharge tube consists of
hydrogen gas at low pressure conditions.
• The discharge tube is an evacuated glass tube
that has metal electrodes at its ends that act as
cathode and anode.
• The stream of fast moving electrons that
produced from cathode travels towards anode
in the discharge tube.
• These accelerated electrons of the cathode rays
give internal energy to the hydrogen electrons
during their collision. Jayam chemistry learners
4. Hydrogen spectral series
• After gaining energy from the source, the
electrons of the hydrogen atoms get excited
from the ground state to one of the higher
energy orbits.
• As everyone knows, the excited state of an
atom is unstable. The excited electrons jump
back to its initial lower energy position
abruptly with the emission of light radiations
of definite wavelengths. It gives a sequence of
spectral lines in the hydrogen emission
spectrum. Jayam chemistry learners
Absorption of energy
Emission of energy
5. Hydrogen spectral series formula
The Rydberg formula helps to calculate the wavelengths of all spectral lines that occur in
the hydrogen spectrum with the help of an empirical fitting parameter known as the
Rydberg constant.
Where,
λ = wavelength of the emitted electromagnetic radiation
n1 = lower energy level of the electron transition
n2 = higher energy level of the electron transition
R= Rydberg constant with value equal to 109678 cm-1
Jayam chemistry learners
6. The six series of the hydrogen spectrum
• The six sequences of the hydrogen emission
spectrum correspond to the discontinuous
spectral line emissions due to quantized
electron energy levels of the hydrogen atom
explained by Niels Bohr.
• The six series of the hydrogen spectrum are;
Jayam chemistry learners
1. Lyman series 4. Brackett series
2. Balmer series 5. Pfund series
3. Paschen series 6. Humphreys series
7. Lyman series
• This series of spectral lines were observed
during electron transition from higher
stationary orbits to the first orbit of the
hydrogen atom.
• It is named after the discoverer Theodore
Lyman.
• And it occurs in the ultraviolet region of the
electromagnetic spectrum.
• The maximum wavelength for the Lyman
series is 121 nm and the minimum wavelength
is 91 nm. Jayam chemistry learners
8. Balmer series
• This series of spectral lines were observed
during electron transition from higher
stationary orbits to the second orbit of the
hydrogen atom.
• It is named after the discoverer Jakob Balmer.
• And it occurs in the visible region of the
electromagnetic spectrum.
• The maximum wavelength for the Balmer
series is 656 nm and the minimum wavelength
is 365 nm.
Jayam chemistry learners
Balmer series
9. Paschen series
• This series of spectral lines were observed
during electron transition from higher
stationary orbits to the third orbit of the
hydrogen atom.
• It is named after the discoverer Friedrich
Paschen.
• And it occurs in the infrared region of the
electromagnetic spectrum.
• The maximum wavelength for the Paschen
series is 1875 nm and the minimum
wavelength is 821 nm. Jayam chemistry learners
10. Brackett series
• This series of spectral lines were observed
during electron transition from higher
stationary orbits to the fourth orbit of the
hydrogen atom.
• It is named after the discoverer Sumner
Brackett.
• And it occurs in the infrared region of the
electromagnetic spectrum.
• The maximum wavelength for the Brackett
series is 4051 nm and the minimum
wavelength is 1458 nm. Jayam chemistry learners
11. Pfund series
• This series of spectral lines were observed
during electron transition from higher
stationary orbits to the fifth orbit of the
hydrogen atom.
• It is named after the discoverer Herman Pfund.
• And it occurs in the infrared region of the
electromagnetic spectrum.
• The maximum wavelength for the Pfund series
is 7460 nm and the minimum wavelength is
2280 nm.
Jayam chemistry learners
12. Humphreys series
• This series of spectral lines were observed
during electron transition from higher
stationary orbits to the sixth orbit of the
hydrogen atom.
• It is named after the discoverer Curtis J.
Humphreys.
• And it occurs in the infrared region of the
electromagnetic spectrum.
• The maximum wavelength for the Humphreys
series is 12.37 μm and the minimum
wavelength is 3.2 μm. Jayam chemistry learners
13. Why does the line spectrum of hydrogen lines become closer as the
frequency increases?
Jayam chemistry learners
Lyman series, the broad series of the hydrogen spectrum, gives thick spectral emissions
towards its end. Likewise, the Balmer and Paschen series are more compact when
compared with the Lyman series. We observe a thick spectral line region at the series limit
of every series. It is the position where the next series starts.
14. Why does the line spectrum of hydrogen lines become closer as the
frequency increases?
Jayam chemistry learners
According to the quantum theory of radiation, the energy difference between the
stationary levels varies directly with the frequency of the emitted light radiation. It
implies the frequency of the emitted photon is higher for electron transitions involving
higher transition states.
Moreover, the stationary orbits are not equally spaced. They are more close together at
higher energy levels. So, the electron transitions involving these closely spaced orbits
give spectral lines packed together.
As a final note, the dense spectral emissions towards the right end of the hydrogen
spectrum imply higher photon frequencies.
15. The end
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