slow down the bombarding neutrons

accelerate the bombarding neutrons

EASY

Earn 100

The fussion process is possible at high temperatures, because at higher temperatures

50% studentsanswered this correctly

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,

The fussion process is possible at high temperatures, because at higher temperatures

Important Questions on Modern Physics

Learn and Prepare for any exam you want !