Two or more nuclides having the same neutron number but different number of protons are said to be isotones. For example S 36 , 37 U , 38 A r , 39 K , 40 C a all contain 20 neutrons.

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Isobars are atoms (nuclides) having same atomic mass number but the different atomic number.

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Important Questions on Nuclei

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

The energy equivalent of

1

gram of substance is:

EASY

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Which are the isotone, isobar, and isotope nuclei respectivley of

{}_{6}^{12}C

from among

{}_{6}^{14}C, {}_{5}^{12}B, {}_{7}^{13}N

EASY

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Who discovered neutron

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

What is the full form of LHC?

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Which of the following elements you need to remove to form an isotone family ?

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Two nuclei have mass numbers in the ratio

1 : 8

. What is the ratio of their nuclear radii?

EASY

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Define atomic mass unit

(u)

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

The ratio of mass densities of nuclei of

^{40} C a

and

^{16} O

is close to:

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

What are isotones?

EASY

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

What are isotopes, isobars and isotones? Given one example for each.

MEDIUM

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

When an

α

-particle of mass

m

moving with a undefined velocity bombards on a heavy nucleus of charge

Ze

, its distance of the closest approach from the nucleus depends on

m

as:

MEDIUM

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Consider the following statements $(X$ and $Y$ stand for two different elements $)$

$I .$ $32 X^{65}$ and ${}_{33}Y^{65}$ are isotopes.

$II .$ $42 X^{86}$ and $42 Y^{85}$ are isotopes.

$III .$ $85 X^{174}$ and $88 Y^{177}$ have the same number of neutrons.

$IV .$ $92 X^{235}$ and ${}_{94}Y^{235}$ are isobars.

The correct statements are:

HARD

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

The electrostatic energy of

Z

protons uniformly distributed throughout a spherical nucleus of radius

R

is given by,

E = \frac{3}{5} \frac{Z (Z - 1) e^{2}}{4 π ε_{0} R}

. The measured masses of the neutron,

{}_{1}^{1}H, {}_{7}^{15}N and {}_{8}^{15}O

are

1.008665 u

1.007825 u, 15.000109 u and 15.003065 u

respectively. Given that the radii of both the

{}_{7}^{15}N and {}_{8}^{15}O

nuclei are same,

1 u = 931.5 MeV c^{- 2}

(

c

is the speed of light) and

\frac{e^{2}}{(4 π ϵ_{0})} = 1.44 MeV fm

. Assuming that the difference between the binding energies of

{}_{7}^{15}N a n d {}_{8}^{15}O

is purely due to the electrostatic energy, the radius of either of the nuclei is

(1 fm = 10^{- 15} m)

EASY

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Define atomic mass unit. Find the energy equivalent to

1 u

(atomic mass unit).

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

If radius of the

{}_{13}^{27}A l

nucleus is taken to be

R_{A l}

then the radius of

{}_{53}^{125}{T e}

nucleus is nearly

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Two protons are kept at separation of

10 nm

. Let

F_{n}

and

F_{e}

be the nuclear force and the electromagnetic force between them

EASY

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Two protons are kept at a separation of

10 nm .

. Let

F_{n}

and

F_{e}

be the nuclear force and the electromagnetic force between them

MEDIUM

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Define 'isotope' and 'isobar' and give one example of each.

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Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

What are isobars? Give one example of isobars.

MEDIUM

Physics>Modern Physics>Nuclei>Atomic Mass and Composition of Nucleus

Draw the diagram representing the schematic arrangement of Geiger Marsden experimental set up of alpha particle scattering experiment.

Isobars are atoms (nuclides) having same atomic mass number but the different atomic number.

Important Questions on Nuclei

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