Consider two arbitrary decay equations and mark the correct alternative(s) given below, i 9 2 2 3 0 U → n + 9 2 2 2 9 U ii 9 2 2 3 0 U → p + 9 1 2 2 9 U Given, mass of U 230 = 230 . 033927 u , mass of U 239 = 229 . 03349 u . M n = 1 . 008665 u , M p = 1 . 007825 u , 1 amu = 931 . 5 MeV .

Neither of the two decays is possible.

Only decay in (ii) is possible.

Consider two arbitrary decay equations and mark the correct alternative(s) given below, i 9 2 2 3 0 U → n + 9 2 2 2 9 U ii 9 2 2 3 0 U → p + 9 1 2 2 9 U Given, mass of U 230 = 230 . 033927 u , mass of U 239 = 229 . 03349 u . M n = 1 . 008665 u , M p = 1 . 007825 u , 1 amu = 931 . 5 MeV .

Neither of the two decays is possible.

slow down the bombarding neutrons

accelerate the bombarding neutrons

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Consider two arbitrary decay equations and mark the correct alternative(s) given below,

$\begin{matrix} (i) & _{92}^{230} U \to n +_{92}^{229} U \\ (ii) & _{92}^{230} U \to p +_{91}^{229} U \end{matrix}$

Given,

$mass of {}^{230}U = 230.033927 u$ , $mass of {}^{239}U = 229.03349 u$ .

$M_{n} = 1.008665 u$ , $M_{p} = 1.007825 u$ , $1 amu = 931.5 MeV$ .

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Important Questions on Nuclear Physics

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

The equation

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

represents.

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

When a uranium isotope

{}_{92}^{235}U

is bombarded with a neutron, it generates

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

, three neutrons and:

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

On the bombardment of neutron with boron,

α

-particle is emitted. The product nuclei formed is

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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>Nuclear Physics>Nuclear Reactions

Moderator is used to

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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>Nuclear Physics>Nuclear Reactions

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>Nuclear Physics>Nuclear Reactions

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

k

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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>Nuclear Physics>Nuclear Reactions

In the given nuclear reaction

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

$X$ represents....

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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>Nuclear Physics>Nuclear Reactions

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

MEDIUM

Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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>Nuclear Physics>Nuclear Reactions

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]

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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 :

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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

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Physics>Modern Physics>Nuclear Physics>Nuclear Reactions

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,

Consider two arbitrary decay equations and mark the correct alternative(s) given below, i92230U→n+92229Uii92230U→p+91229U Given, mass of U230=230.033927 u, mass of U239=229.03349 u. Mn=1.008665 u, Mp=1.007825 u, 1 amu= 931.5 MeV.

Important Questions on Nuclear Physics

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