Atoms – Notes
Alpha Particle Scattering and Rutherford’s Nuclear of an Atom
The scattering of Alpha particles from the atoms of an element is helpful in understanding the structure of the atom.
Angle of scattering is defined as t he angle between the path of incident particle on the gold foil and the path of the scattered particle away from the gold foil.
The entire positive charge and most of the mass of the atom is concentrated at the centre of the atom called a nucleus.
Rutherford’s atomic model is also known as the planetary model of the atom.
Based on Rutherford’s experiments, the size of the nucleus was estimated to be around 10-15m to 10-14m.
The atom is about 10,000 to 100,000 times larger than its nucleus.
Impact parameter (b) is defined as the perpendicular distance between the direction of the initial velocity of the alpha particle and the nucleus of the gold atom.
When a metallic body is heated, it emits electromagnetic radiation consisting different wavelengths.
A hydrogen sample also emits radiation with wavelengths greater than those in the visible region.