The Bohr Model Put the four equations from the previous slide together to show that h’e, Tme? r =n 1 me E, n2 8eh? In general, a negative sign indicates a bound state. The system must receive energy in order to be broken up. Here, breaking up the system means removing the electron (ionizing the atom). 13.6eV 々? Planck's constant h = 6.626x10-4 Js Electric permittivity of the vacuum E, = 8.854 x10-12, Nm? m =9.11x10" kg Mass of the electron -31 Charge of the electron e =1.602 x10-1ºC
Atomic Spectra
According to the Bohr model of an atom, the electron in an atom moves around a nucleus in fixed orbits with specific energies known as energy levels. The orbital energies are quantized. The electrons remain in these energy levels until they emit or absorb a photon of a particular wavelength, the quantum of energy. If the electron emits a photon, it then falls back to a lower energy level, and if it absorbs a photon, the electron rises to higher energy levels. The photons released or absorbed in these transitions of an electron are studied and analyzed on a screen as atomic spectra.
Ruby Lasers
Lasers are devices that emit light using atoms or molecules at a certain wavelength and amplify the light to produce a narrow beam of radiation. It works as per the principle of electromagnetic radiation. Their source of emission contains the same frequency and same phase. It was invented in the year 1960 by the great noble scientist, Theodore Maiman.
Balmer Series
The spectrum of frequency observed when electromagnetic radiation is emitted from an atom when it goes from higher energy state to lower state, is known as emission spectrum. This transition occurs when an excited electron moves from higher to lower state. It has many possible electron transitions and each transition has a specific energy difference.
Emission Spectrum
Every state of matter tries to be at minimum potential energy or it can be said that the atoms of element/ substance arrange themselves such that overall energy is minimum.
Combine the equations on slide 10 to obtain the expressions for the radius of the electron orbit and the energy of the hydrogen atom given on slide 11.
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