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Bohr's Model of an Atom

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What is the meaning of this sentence'' repulsive electrostatic force between protons should make a nucleus unstable''?

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Q. Statement I: Neutron to proton ratio less than 1 especially in a heavy nucleus makes it highly unstable.
Statement II: Nucleus where protons are separated by a large distance are dominated by repulsive electrostatic force.

Which of the following is correct ?

Statement I: Neutron to proton ratio less than 1 especially in a heavy nuclei makes it highly unstable.

Statement II: Nucleus where protons are separated by a large distance are dominated by repulsive electrostatic force.

Q. Repulsive forces exists between two protons outside the nucleus. This is due to

Q. The radius of a nucleus is given by

r_{0} A^{1 / 3}

r_{0} = 1.3 \times 10^{15} m

A

is the mass number of the nucleus. The Lead nucleus has

A = 206

. The electrostatic force between two protons in this nucleus is approximately.

Q. Consider a gold nucleus to be a sphere of radius 6.9 fermi in which protons and neutrons are distributed. Find the force of repulsion between two protons situated at largest separation. Why do these protons not fly apart under this repulsion?

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