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Standard IX

Physics

Nuclear Stability

The mass defe...

Question

The mass defect in a nucleus is because of:

nucleons

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electrons

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positrons

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both electrons and protons

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Solution

The correct option is A
nucleons

The Mass effect is the difference in the mass of a nucleus and the nucleons separated to infinity. So, it is the nucleons only who are responsible for the mass defect, and not the electrons.

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Similar questions

Q. Nuclear binding energy is the energy released during the hypothetical formation of the nucleus by the condensation of individual nucleons. Thus, binding energy per nucleon =

\frac{Total binding energy}{Number of nucleons}

For example, the mass of hydrogen atom is equal to the sum of the masses of a proton and an electron. For other atoms, the atomic mass is less than the sum of the masses of protons, neutrons and electrons present. This difference in mass, termed as mass defect, is a measure of the binding energy of protons and neutrons in the nucleus. The mass-energy relationship postulated by Einstein is expressed as:

Δ E = Δ m c^{2}

Where

Δ E

is the energy liberated,

Δ m

is the loss of mass, and c is the speed of light.

M P

and

M n

are masses of a proton and a neutron respectively. For a nucleus, its binding energy is

B

and it contains

Z

protons and

N

neutrons, the correct relation for this nucleus if

C

is velocity of light is:

A Atom has a nucleus which is surrounded by electrons and protons. A cell in a leaf also has a nucleus, so the nucleus in the leaf also has electrons and protons surrounding it?

State whether True or False.

(a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.
(b) A neutron is formed by an electron and a proton combining. Therefore, it is neutral.
(c) The mass of an electron is about

\frac{1}{2000}

times that of a proton.

Q. How many electrons, protons and neutrons are there in a nucleus of atomic number

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and mass number

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?
(i) number of electron

=

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(ii) number of protons

=

________.
(iii) number of neutrons

=

_______.

Q. How many nucleons are present in a carbon atom that has 6 protons, 6 electrons and 6 neutrons?

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The mass defect in a nucleus is because of:

The correct option is A nucleons The Mass effect is the difference in the mass of a nucleus and the nucleons separated to infinity. So, it is the nucleons only who are responsible for the mass defect, and not the electrons.

The correct option is A
nucleons

The Mass effect is the difference in the mass of a nucleus and the nucleons separated to infinity. So, it is the nucleons only who are responsible for the mass defect, and not the electrons.