EASY

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In the carbon cycle of nuclear fusion carbon acts like a catalyst.

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Important Questions on Nuclei

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Define nuclear fission.

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)

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]

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Write one balanced equation to show Nuclear fission.

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

What is pair production?

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

What is meant by pair annihilation Write a balanced equation for the same.

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Write one balanced equation of Nuclear fusion.

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Name a material which is used in making control rods in a nuclear reactor.

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

A photon of energy 1.12 MeV splits into electron-positron pair. The velocity of electron is (Neglect relativistic correction)

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Graphite is used in nuclear reactor for reducing the _____ of neutrons.

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

For a deuteron and an alpha particle, binding energies per nucleon are

x_{1}

, and

x_{2}

respectively then the energy released

Q

in the fusion reaction is

{}_{1}^{2}H +_{1}^{2} H + \to_{2}^{4} He + Q

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Considering a hypothetical annihilation of a stationary electron with a stationary positron, the wavelength of resulting radiation? (with usual notations)

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

In order to minimise the neutron leakage, neutron _____ surround reactor cores.

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

γ

-ray photon creates an electron, positron pair. The rest mass of electron is 0.5 MeV. KE of the electron - positron pair system is 0.78 MeV. Then the energy of

γ

-ray photon is

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Breeder reactors are designed to generate nuclear fuel at the same time as producing energy for _____ production.

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Q

-value is the difference between the final and _____ mass-energy of the decayed products.

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

In the carbon cycle of nuclear fusion carbon acts like a _____.

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

Following process is known as

h v \leftrightarrow e^{+} + e^{-}

HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

$_{35} X^{88}$ is an unstable isotope which decays in two successive steps to produce stable isotope of $_{35} X^{88} \overset{I}{\to} Z {\overset{II}{\to}}_{36} Y^{87}$ . The correct statement (s) is/are:

In the carbon cycle of nuclear fusion carbon acts like a catalyst.

Important Questions on Nuclei

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