slow down the bombarding neutrons

accelerate the bombarding neutrons

EASY

Earn 100

If the nucleons of a nucleus are separated far apart from each other, the sum of masses of all these nucleons is larger than the mass of the nucleus.

Calculate the energy released if ${}^{238}U$ nucleus emits an $α -$ particle.

Given:

Atomic mass of $_{}^{238} U = 238.0508 u$

Atomic mass of $_{}^{234} T h = 234.04363 u$

Atomic mass of alpha-particle $= 4.00260 u and 1 u = 931 \frac{M e V}{c^{2}}$

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Important Questions on Modern Physics

EASY

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

The equation

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

represents.

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

When a uranium isotope

{}_{92}^{235}U

is bombarded with a neutron, it generates

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

, three neutrons and:

EASY

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

On the bombardment of neutron with boron,

α

-particle is emitted. The product nuclei formed is

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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

)

EASY

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

Moderator is used to

EASY

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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>Modern Physics>Nuclear Reactions: Fission and Fusion

The missing one $(?)$ in the following reaction is ${}^{9}B e + {}^{4}H e \to 3^{4} H e + ?$

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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

HARD

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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>Modern Physics>Nuclear Reactions: Fission and Fusion

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

k

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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

EASY

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

In the given nuclear reaction

${}_{4}^{9}B e + {}_{2}^{4}H e ⟶ {}_{6}^{12}C + X$ ,

$X$ represents....

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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>Modern Physics>Nuclear Reactions: Fission and Fusion

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

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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.

HARD

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

A nucleus of mass

M

emits

γ

-ray photon of frequency

v

. The loss of internal energy by the nucleus is: [Take

c

as the speed of electromagnetic wave]

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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 :

MEDIUM

Physics>Modern Physics>Modern Physics>Nuclear Reactions: Fission and Fusion

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>Modern Physics>Nuclear Reactions: Fission and Fusion

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,

Important Questions on Modern Physics

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