The Atomic Spectra Notes by Sir Waqar Hussain
Important Easy Notes of Physics of Chapter No. 18: The Atomic Spectra written by Professor Mr. Waqar Hussain Suib. These notes are very helpful in the preparation of Physics for students of the 12th class and these are according to the paper patterns of all Sindh Book Boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
- Definition of Atomic Spectroscopy
- State Bohr Atomic Model of hydrogen
- State Determination of Atomic Radii
- Determination of the Energy of an Electron in a “Stationary State”
- State and Explain Hydrogen Spectrum
- State and Explain Series of hydrogen spectrum
- State Lyman Series with its Notation
- State Balmer Series with its Notation
- State Paschen Series with its Notation
- State Brackett Series with its Notation
- State Pfund Series with its Notation
- What is X-Rays and Generation of X-rays
- What is X-Ray Spectra and X-Ray Continuous Spectra (X-ray Bremsstrahlung) with Explanation
- State and Explain X-ray line spectra (Characteristic Spectra)
- State and Explain Basic Conditions to Produce Laser with its Principle of Laser and Explanation.
- Applications of Laser with its Laser as Accurate Cutter, Application in Media, Application in Surgery, Application as Range Finder, Application in Electrical Devices, Application in Environmental Study, Application in Nuclear Fusion.
- State and Explain RUBY LASER with its Construction and Working.
- A blood corpuscle has diameter about 9 x 10–6 m. In which excited orbit should a
hydrogen atom so that it is just about as big as the blood corpuscle.
- The energy of the lowest level of hydrogen atom is –13.6 eV. Calculate the energy of
the emitted photons in transition from n = 4 to n = 2.
- Find the wavelength of light which is capable of ionizing a hydrogen atom.
- The energy of an electron in an excited hydrogen atom is –3.4 eV. Calculate the angular
momentum of the electron according to Bohr’s Theory.
- What is the wavelength of the radiation that is emitted when hydrogen atom
undergoes a transition from the state n2 = 3 to n1 = 2.
- What is the longest wavelength of light capable of ionizing a hydrogen atom? What
energy in electron volt is needed to ionize it?
- A photon of 12.1 eV absorbed by a hydrogen atom originally in the ground state raises
the atom to an excited state. What is the quantum number of this state?
(E1 = –13.6 eV).
- An electron in the hydrogen atom makes a transition from the n = 2 energy state to the
ground state (corresponding to n = 1) find the wavelength in the ultraviolet region.
- In a hydrogen atom an electron experiences transition from a state whose binding
energy is 0.54 eV to the state whose excitation energy is 10.2 eV.
a) The quantum numbers of the two states
b) The wavelength of the photon emitted.
- Calculate the Binding Energy of a hydrogen atom.
- Calculate the longest and shortest wavelengths of emitted photons where RH = 1.097
x 107 m–1.
- Find the shortest wavelength of photon emitted in the Balmer series and determine its
energy in eV. (RH = 1.097 x 107 m–1
).
- Calculate the energy of the longest wavelength radiation emitted in the Paschen series
in hydrogen atom spectra. (RH = 1.0968 x 107 m–1
, h = 6.63 x 10–34Js, m c = 3 x 108 m/s).
- Find the value of shortest and the longest wavelength of emitted photon in hydrogen
spectra in Balmer series. (Rydberg constant = 1.097 x107 m-1
).
- A hydrogen atom in the ground state gets excited by absorbing a photon of 12.15 eV.
Find the Quantum number of this state.
- Determine the longest and shortest wavelength of photons emitted in the Lyman series.
(RH=1.097 x 107 m -1
).
- Find the shortest wavelength of photon emitted in the Balmer series and determine its
energy in eV. (RH = 1.097 x 107 m–1
).