EASY

Earn 100

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : The binding energy per nucleon is practically independent of the atomic number for nuclei of mass number in the range $30$ to $170$ .

Reason R : Nuclear force is short ranged.

In the light of the above statements, choose the correct answer from the options given below

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Important Questions on Nuclei

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

If the binding energy of

N^{14}

7.5 MeV

per nucleon and that of

N^{15}

7.7 MeV

per nucleon, then the energy required to remove a neutron from

N^{15}

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

In the following passage there are blanks, each of which has been numbered. There are questions given below the passage and for each question, four words are suggested, one of which fits the blank appropriately. Find out the appropriate word in each case.

Whenever I go into a bank, I feel scared. Everybody and everything that I see there (1) ____ me. As for the manager the sight (2) ____ him simply terrifies me and (3) ____ me want to runaway (4) _____ I can. As soon as I (5) ____ the door of the bank I lose my head (6) ____ when I try to do any (7) ____ there, I behave like an idiot. I cannot explain (8) ____ for this but that is how it (9) ____ has been that is how it is (10) ____.

Select the most appropriate option for blank No. 10.

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

What is the binding energy of ${}_{14}^{29}S i$ whose atomic mass is $28.976495 u$

Mass of proton $= 1.007276 u$

Mass of neutron $= 1.008664 u$

(Neglect the electron mass) (Assume $1 u = 931.5 MeV$ )

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

In a certain mass spectrometer, an ion beam passes through a velocity filter consisting of mutually perpendicular fields E and B. The beam then enters a region of another magnetic field

B^{'}

, perpendicular to the beam. The radius of curvature of the resulting ion beam is proportional to

MEDIUM

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

Two deuterons undergo nuclear fusion to form a Helium nucleus. The energy released in this process is (given binding energy per nucleon for deuteron

= 1.1 MeV

and for helium

= 7.0 MeV

)

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

The mass-defect in a nuclear fusion reaction is

0.3

per cent. The amount of energy released in one

kg

of fusion reaction is

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

You are given that Mass of

{}_{3}^{7}{Li} = 7.0160 u,

Mass of

{}_{2}^{4}{He} = 4.0026 u

and Mass of

{}_{1}^{1}{He} = 1.0079 u

. When

20 g

{}_{3}^{7}{Li}

is converted into

_{2}^{4} He

by proton capture, the energy liberated, (in

kWh

), is: [Mass of nucleon

= 1 GeV / c^{2}

]

MEDIUM

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

A nucleus with mass number

240

breaks into two fragments each of mass number

120,

the binding energy per nucleon of unfragmented nuclei is

7.6 MeV

while that of fragments is

8.5 MeV

. The total gain in the binding energy in the process is :

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

The binding energy per nucleon of

{}_{5} B^{10}

8.0 MeV

and that of

{}_{5} B^{11}

7.5 MeV .

The Energy required to remove a neutron from

{}_{5} B^{11}

is (mass of electron and proton are

9.11 \times 10^{- 31} kg

and

1.67 \times 10^{- 27} kg

)

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

If the binding energy of the electron in a hydrogen atom is

13.6 eV

, the energy required to remove the electron from the first excited state of

{Li}^{+ +}

is :

MEDIUM

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

The ratio of the binding energies of three nuclei is

1 : 4 : 9

. If the ratio of their nuclear radii is

1 : 2 : 3

, the nuclei in the decreasing order of the stability can be arranged as

HARD

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

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>Mass-Energy and Nuclear Binding Energy

The binding energy per nucleon of

{{}_{8}C}^{12} = 12.0038 amu

, mass of neutron

= 1.00898 amu

and mass of proton

= 1.007599 amu

MEDIUM

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

A nucleus

X

emits a

β

-particle to produce a nucleus

Y

. If their atomic masses are

M_{x}

and

M_{y}

respectively, then the maximum energy of the

β

-particle emitted is (where,

m_{e}

is the mass of an electron and

c

is the velocity of light)

MEDIUM

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

From the given data, the amount of energy required to break the nucleus of aluminium ${}_{13}^{27}{Al}$ is __________ $x \times 10^{- 3} J$ .

Mass of neutron $= 1.00866 u$
Mass of proton $= 1.00726 u$
Mass of Aluminium nucleus $= 27.18846 u$
(Assume $1 u$ corresponds to $x J$ of energy)
(Round off to the nearest integer)

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

How many energy will be released in joule due to mass defect of

1

gram?

EASY

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

Which of the following statement is correct?

MEDIUM

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

Find the Binding energy per nucleon for

{}_{50}^{120}{Sn}

. Mass of proton

m_{p} = 1.00783 u

, mass of neutron

m_{n} = 1.00867 u

and mass of tin nucleus

m_{Sn} = 119.902199 u

. (take

1 u = 931 MeV

)

HARD

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

Consider the nuclear fission,

{Ne}^{20} \to 2 {He}^{4} + C^{12}

. Given that the binding energy/nucleon of

{Ne}^{20}, {He}^{4}

and

C^{12}

are

8.03 MeV, 7.86 MeV

, respectively. Identify the correct statement:

MEDIUM

Physics>Modern Physics>Nuclei>Mass-Energy and Nuclear Binding Energy

The Binding energy per nucleon of

{}_{3}^{7}{L i}

and

{}_{2}^{4}{H e}

nuclei are

5.60 MeV

and

7.06 MeV

, respectively. In the nuclear reaction

_{3}^{7} L i +_{1}^{1} H \to 2_{2}^{4} H e + Q

, the value of energy

Q

released is

Important Questions on Nuclei

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