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An unknown chemical element is presented by the following formula: $_{Z}^{A} X .$ What is the name of index A?

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Important Questions on Nuclei

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

The energy required to break one bond in DNA is

10^{- 20} J

. This value in

eV

is nearly

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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:

MEDIUM

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

The energy equivalent of

0.5 g

of a substance is:

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

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>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

MEDIUM

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

In a process, certain amount of mass gets converted into energy. Let all the energy so converted be in the form of photons. If

700 \times 10^{12} Hz

is the mean frequency of the photons and if there are approximately

10^{30}

photons, what is the approximate mass that is converted into photons? (Assume

h = 6.6 \times 10^{- 34} J s, c = 3 \times 10^{8} m s^{- 1}

)

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

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>Atomic Mass and Composition of Nucleus

The energy equivalent to a substance of mass $1 g$ is

MEDIUM

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

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

)

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

Imagine that a reactor converts all the given mass into energy and that it operates at a power level of

10^{9} Watt

. The mass of the fuel consumed

per hour

, in the reactor, will be:
(velocity of light,

c

3 \times 10^{8} m s^{- 1}

)

HARD

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

The nuclear radius is given by

R = r_{0} A^{1 / 3},

where

r_{0}

is constant and A is the atomic mass number. Then, the nuclear mass density of

U^{238}

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)

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

Density of nuclear matter is nearly

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

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 $1 u = 931.5 MeV$ )

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

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

MEDIUM

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

Find the energy equivalent of one atomic mass unit in Joules and in

MeV .

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

The binding energy of a nucleus is equivalent to

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

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 :

HARD

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

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:

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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.

An unknown chemical element is presented by the following formula: ZAX. What is the name of index A?

Important Questions on Nuclei

Learn and Prepare for any exam you want !

An unknown chemical element is presented by the following formula: $_{Z}^{A} X .$ What is the name of index A?