slow down the bombarding neutrons

accelerate the bombarding neutrons

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An atom bomb is based on the principle of :

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Important Questions on Nuclei

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

In a nuclear reactor heavy nuclei is not used as moderators because

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Physics>Modern Physics>Nuclei>Nuclear Energy

The energy of the fast neutrons emitted in a nuclear fission reactor is approximately _____

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

When

{{}_{92}U}^{235}

undergoes fission, about

0.1 %

of the original mass is converted into energy. The energy released when

1 kg

{{}_{92}U}^{235}

undergoes fission is

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

200 MeV

energy is released when one nucleuls of

{}^{235}U

undergoes fission. The approximate energy released by fission of

2 kg

of uranium is

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

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

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

5 mg

{}^{235}U

is completely destroyed in an atom bomb, then approximate total energy released is (given that the energy released per fission is

200 MeV

)

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

A nucleus with mass number

184

initially at rest emits an

α -

particle. If the

Q

value of the reaction is

5.5 MeV,

calculate the kinetic energy of the

α -

particle.

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

The explosion of atom bomb is based on the principle of

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

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>Nuclei>Nuclear Energy

Moderator is used to

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Physics>Modern Physics>Nuclei>Nuclear Energy

In a nuclear reactor, the main purpose of the moderator is to

HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

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:

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

The most suitable element for nuclear fission is the element with atomic number near

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

The binding energy per nucleon of

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

and

{}_{2}{He}^{4}

nuclei are

5.60 MeV

and

7.06 MeV,

respectively. Then, in the nuclear reaction

{{}_{3}L}^{7} + {{}_{1}H}^{1} ⟶ {}_{2}{He}^{4} + {}_{2}{He}^{4} + Q,

the value of

Q .

the energy released, is

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Physics>Modern Physics>Nuclei>Nuclear Energy

In nuclear reactor, cadmium rods are used as:

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Physics>Modern Physics>Nuclei>Nuclear Energy

The sun releases energy by

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Physics>Modern Physics>Nuclei>Nuclear Energy

A chain reaction is possible when the mass of the fuel is greater than the

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Physics>Modern Physics>Nuclei>Nuclear Energy

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

k

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

When a uranium isotope

{}_{92}^{235}U

is bombarded with a neutron, it generates

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

, three neutrons and:

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

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,

An atom bomb is based on the principle of :

Important Questions on Nuclei

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