Welcome to your Ncert - class 9- science - Chapter 4 – Structure of the Atom 2
Goldsteins experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
The ratio of the radii of the first three Bohr orbits is:
If an electron moves away from nucleus, its potential energy:
The expression for Bohr's radius of an atom is
The presence of electrons outside the nucleus and nucleus at the centre of the atom was suggested by:
How many sub-atomic particles are present in an α- particle used in Rutherford's scattering experiment?
The nucleus of helium contains
Which of the following is not a correct statement according to Rutherford's atomic model?
The introduction of a neutron into the nuclear composition of an atom would lead to a change in:
Neutron is a fundamental particle carrying:
Which one of the following is considered as the main postulate of Bohr's model of atom
Bohr's theory can be applied to determine the?
Which of the following statements about Rutherford’s model of atom are correct?
The radius of the first Bohr orbit of hydrogen atom is
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