slow down the bombarding neutrons

accelerate the bombarding neutrons

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Assuming that four protons combine to form a helium nucleus and two positrons each of mass $0.000549 a . m . u .$ , calculate the energy released. Given, the mass of $_{1} H^{1} = 1 .007825$ $a . m . u .$ and mas of $_{2} {He}^{4}$ $= 4.002603 a . m . u .$

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Important Questions on Nuclear Physics

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

When a uranium isotope

{}_{92}^{235}U

is bombarded with a neutron, it generates

{}_{36}^{89}{Kr}

, three neutrons and:

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

A nucleus, initially at rest, breaks up into two nuclear fragments with their radii in the ratio

2 : 1 .

Then their velocities will be in the ratio

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

An electron, a doubly ionized helium ion

({He}^{+ +})

and proton are having the same kinetic energy. The relation between their respective de-Broglie wavelength

λ_{e}, λ_{{He}^{+ +}}

and

λ_{p}

is :

EASY

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

The scientific principle that forms the basis of the Tokamak technology is

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

The Binding energy per nucleon of

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

and

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

nucleon are

5.60 M e V

and

7.06 M eV

, respectively. In the nuclear reaction

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

, the value of energy

Q

released is

EASY

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

If the energy released in the fission of one nucleus is

3.2 \times 10^{- 11} J

, then number of nuclei required per second in a

16 kW

power plant is

HARD

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

In a reactor,

2 kg

{}_{92}U^{235}

fuel is fully used up in

30

days. The energy released fission is

200 MeV

. Given that the Avogadro number,

N = 6.023 \times 10^{26}

per kilo mole and

1 eV = 1.6 \times 10^{- 19} J

. The power output of the reactor is close to:

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

On the bombardment of neutron with boron,

α

-particle is emitted. The product nuclei formed is

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

Rewrite and complete the following nuclear reaction by filling in the atomic number of Ba and mass number of Kr:

${}_{92}^{235}U + {}_{0}^{1}n \to {}_{___}^{144}{Ba} + {}_{36}^{___}{Kr} + 3 {}_{0}^{1}n + Energy$

EASY

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

Define nuclear fission.

EASY

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

The equation

4_{1}^{1} H^{+} \to {}_{2}^{4}{He}^{2 +} + 2 e^{- 1} + 26 MeV

represents.

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

2 M e V

neutron is emitted in a fission reactor. If it looses half of its kinetic energy in each collision with a moderator atom, how many collisions must it undergo to achieve thermal energy of

0.039 e V

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

For nuclei with mass number close to

119

and

238

, the binding energies per nucleon are approximately

7.6 MeV

and

8.6 MeV

, respectively. If a nucleus of mass number

238

breaks into two nuclei of nearly equal masses, what will be the approximate amount of energy released in the process of fission?

EASY

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

A nucleus ruptures into two nuclear parts which have their velocity ratio equal to

2 : 1

, What will be the ratio of their nuclear size (nuclear radius):-

EASY

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

Moderator is used to

HARD

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

Explain the principle and working of a nuclear reactor with the help of a labelled diagram.

EASY

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

A nuclear fission is said to be critical when multiplication factor of

k

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

The ratio of the energy released by

4 kg

of hydrogen at sun by fusion process to

23.5 kg

{}^{235}U

in the nuclear reactor by fission process is (Assume energy released per fusion is

26 MeV

and that per fission is

200 MeV

)

HARD

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

Suppose a

{}_{88}^{226}{R a}

nucleus at rest and in ground state undergoes

α

-decay to a

{}_{86}^{222}{R n}

nucleus in its excited state. The kinetic energy of the emitted

α

particle is found to be

4.44 M e V . {}_{86}^{222}R n

nucleus then goes to its ground state by

γ

-decay. The energy of the emitted

γ

-photon is _______

k e V,

[Given: atomic mass of

_{88}^{226} R a = 226.005 u,

atomic mass of

_{86}^{222} R n = 222.000 u,

atomic mass of

α

particle

= 4.000 u, 1 u = 931 M e V / c^{2}, c

is speed of the light]

MEDIUM

Physics>Modern Physics>Nuclear Physics>Fission and Fusion Processes

A nuclear fuel rod generates energy at a rate of

5 \times 10^{8} W m^{- 3} .

It is in the shape of a cylinder of radius

4.0 mm

and length

0.20 m .

A coolant of specific heat

4 \times 10^{3} J {kg}^{- 1} K^{- 1}

flows, past it at a rate of,

0.2 kg s^{- 1}

. The temperature rise in this coolant is approximately,

Assuming that four protons combine to form a helium nucleus and two positrons each of mass 0.000549 a.m.u., calculate the energy released. Given, the mass of 1H1=1.007825 a.m.u. and mas of 2He4 =4.002603 a.m.u.

Important Questions on Nuclear Physics

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Assuming that four protons combine to form a helium nucleus and two positrons each of mass $0.000549 a . m . u .$ , calculate the energy released. Given, the mass of $_{1} H^{1} = 1 .007825$ $a . m . u .$ and mas of $_{2} {He}^{4}$ $= 4.002603 a . m . u .$