In 1905, it was Einstein who suggested the concept of light having a dual nature; particle and wave nature. In a similar way, Louise de Broglie suggested that electron also exhibits a dual nature. Broglie also got Physics Noble Prize for his this theory. Now, Bohr ...

Though the Bohr and sommerfeld were able to explain the atomic spectra of hydrogen and like species but still there were many  anomalies to their theory. Both Bohr’s theory and sommerfeld’s extension to Bohr model were not able explain the spectra of species with more ...

Bohr was able to calculate the radii as well energies of the stationary orbit around the nucleus in an atom and those calculated values were found to be in a good agreement with the experimental values.   He also gave the Hydrogen ion spectrum. For these ...

According to Bohr, when an electron from its initial stationary orbit with n= ni jumps to another (lower) stationary orbit with n=nf, it emits energy equal to the difference between the energy of the two stationary orbits in the form of small packets of light ...

There was one major objection to the Rutherford model of atom and Bohr was the one to point it out. So while giving his Theory of hydrogen atom, he took the essential features from the Rutherford model of atom but made a change in order ...

Well it is very much evident that photoelectric effect can only be explained if particle nature of light is considered. But there are some phenomenons like diffraction, polarization of light and interference can only be explained if wave nature of light is considered. So we ...

It was Robert Millikan who tested the Einstein photoelectric equation. He first calculated the kinetic energy gained by the emitted electrons for a number of frequencies by applying an opposing potential and finding the value at which the photoelectric current stops. Knowing the values of ...

The Quantum Theory of Radiations by Max Planck can explain the photoelectric effect very well. Max Planck says that light is made of bundles of energy known as photons, energy of each photon being equal to hγ, γ being the frequency of the light. So ...