slow down the bombarding neutrons

accelerate the bombarding neutrons

EASY

Earn 100

Hydrogen bomb has been prepared by the fusion of:

50% studentsanswered this correctly

Important Questions on Nuclei

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

The equation

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

represents.

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:

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

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

EASY

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

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

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

On the bombardment of neutron with boron,

α

-particle is emitted. The product nuclei formed 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

HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

Explain the process of release of energy in a nuclear reactor. Draw a schematic diagram of a nuclear reactor and write the function of each part.

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Define nuclear fission.

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

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

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

HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

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

HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

A fission reaction is given by

{}_{92}^{236}U \to {}_{54}^{140}{X e} + {}_{38}^{94}{S r} + x + y

, where

x

and

y

are two particles. Considering

{}_{92}^{236}U

to be at rest, the kinetic energies of the products are denoted by

K_{X e}, K_{S r}, K_{x} (2 M e V)

and

K_{y} (2 M e V)

, respectively. Let the binding energies per nucleon of

{}_{92}^{236}U, {}_{54}^{140}{X e}

and

{}_{38}^{94}{S r}

7.5 MeV

8.5 MeV

, and

8.5 MeV

respectively. Considering different conservation laws, the correct option(s) is (are)

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

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

What do you understand by nuclear fission? Explain the process with the help of nuclear reaction.

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

Some scientists have predicted that global nuclear war on the earth would be followed by a severe "Nuclear Winter". What might be basis of this prediction?

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Explain the process of release of energy in a nuclear reactor. Draw a schematic diagram of the nuclear reactor.

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

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 :

HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

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>Nuclei>Nuclear Energy

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

Hydrogen bomb has been prepared by the fusion of:

Important Questions on Nuclei

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