When atoms are bombarded with alpha particles, only a few in millon suffer deflection, other pass out undeflected. This is because. The nucleus occupies much smaller volume compared to the volume of the atom.
Q. Why did few alpha particles after striking the gold foil retrace their path?
c) Few α – particle after striking the gold foil retrace their path shows that the positively charged centre was concentrated in a very small volume of space and was called nucleus.
Table of Contents
- Q. Why did few alpha particles after striking the gold foil retrace their path?
- Q. What is the meaning of alpha particles?
- Q. How did the gold foil experiment work?
- Q. Can Aluminium foil be used in alpha particle scattering experiment?
- Q. What differences would Rutherford have observed if he used Aluminium foil instead of gold foil?
- Q. How was Rutherford able to estimate the size of the gold nucleus?
- Q. When a silver foil was used in an alpha ray scattering?
- Q. What is the size of an alpha particle?
- Q. Why Alpha particles are deflected?
Q. What is the meaning of alpha particles?
Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together, thus having a mass of four units and a positive charge of two.
Q. How did the gold foil experiment work?
The Rutherford Gold Foil experiment shot minute particles at a thin sheet of gold. It was found that a small percentage of the particles were deflected, while a majority passed through the sheet. This caused Rutherford to conclude that the mass of an atom was concentrated at its center.
Q. Can Aluminium foil be used in alpha particle scattering experiment?
Thus, Aluminium foil cannot be used in α ray scattering experiment.
Q. What differences would Rutherford have observed if he used Aluminium foil instead of gold foil?
The scattering angles would have changed, but the qualitative results would also change: the reason Rutherford chose gold was because it is EXTREMELY malleable. One can stretch gold foil until it is only a few atoms thick in places, which is not possible with aluminum.
Q. How was Rutherford able to estimate the size of the gold nucleus?
A small fraction of the -particles came close to the nucleus of a gold atom as they passed through the foil. By carefully measuring the fraction of the -particles deflected through large angles, Rutherford was able to estimate the size of the nucleus.
Q. When a silver foil was used in an alpha ray scattering?
When a silver foil (Z=47) was used in an α-ray scattering experiment, the number of α-particles scattered at 30 was found to be 200 per minute. If the silver foil is replaced by aluminum (Z=13) foil of the same thickness, the number of α-particles scattered per minute at 30 is nearly equal to. A. 15.
Q. What is the size of an alpha particle?
Alpha radiation has been identified as helium nuclei that have been stripped of their planetary electrons, and each consists of two protons and two neutrons. α particles thus have a mass of about 4 amu (6.642×10−4 g) each and a positive charge of 2.
Q. Why Alpha particles are deflected?
Alpha particles are are positively charges particles that are made up of 2 protons, 2 neutrons and zero electrons. Due to the fact that protons have a +1 charge and neutrons hold no charge, this would give the particle a +2 charge over all. This in turn either deflected the particle or adjusted its path.
