^Inertia Natural tendency to resist change in the state of motion or rest or direction is called inertia. Changes of state means from rest to motion or from motion to rest or from moving in one direction to other. Inertia of a body is proportional to mass of that body. Due to inertia of rest […]
^Velocity of electron in nth orbit
^Radius of nth orbit
^Angular momentum quantization An electron can revolve around the nucleus only in those orbits where the circumference of the orbit is integral multiple of the wavelength. Such orbits are called stationary. Here is the minimum value of angular momentum in the first orbit of any H-like atom. Frank-Hertz experiment (1914) experiment experimentally demonstrated the existence […]
^Bohr’s model Bohr’s theory It is applicable for single electron system i.e. hydrogen & hydrogen like atoms e.g. He+, Li2+, Be3+
^Rutherford experiment In 1911 Rutherford, Geiger & Marsden studied the scattering of alpha particles on passing a narrow beam of alpha particles through a thin gold foil. Conclusions of their experimental in 1913 which led to the discovery of the nucleus. Rutherford’s model discovered nucleus successfully explained the large angle scattering of alpha particles & […]
^Davisson & Germer experiment This experiment (1927) established the wave nature of slow moving electrons. In this method a fine beam of accelerated electrons is allowed to strike normally on the nickel crystal and then the intensity of scattered electrons in a given direction is found by using a rotate able detector at various scattering […]
^Pair annihilation It is the reverse of pair production effect. Experiments reveal that when a positron passes through matter & sees an electron and the two come together under the influence of their internal electric attraction, may form an atom like configuration called positronium, where they rotate around each other about the centre of mass […]
^Pair production Actually 1.02 MeV is the rest mass energy of a pair of Electron & positron. If the energy of photon striking the nucleus is greater than 1.02 MeV, then this excess energy is shared equally by the Electron & positron as the KE. Pair production effect can’t take place in vacuum. As it […]
^Pair production effect When a photon of energy atleast 1.02 MeV interacts with a nucleus a pair of particles (one electron & one positron) is produced. This is called Pair production effect. The probability of the Pair production effect increases with energy of photon striking the nucleus & atomic number of the target nucleus. γ […]
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