Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 1

HARD

JEE Main/Advance

IMPORTANT

Earn 100

Three photons coming from emission spectra of hydrogen sample are picked up. Their energies are $12.1 eV, 10.2 eV$ and $1.9 eV$ . These photons must come from

12.5% studentsanswered this correctly

Important Questions on Nuclear Physics

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 2

In a hypothetical atom, if transition from

n = 4 to n = 3

produces visible light then the possible transition to obtain infrared radiation is :

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 3

A neutron star has a density equal to that of the nuclear matter

(\approx 3 \times 10^{17} kg m^{- 3}) .

Assuming the star to be spherical, find the radius of a neutron star whose mass is

(i) 4.0 \times 10^{30} kg

(twice the mass of the sun)

(ii) 6 \times 10^{24} Kg

(around mass of the earth).

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 4

Assuming the radius of a nucleus to be equal to

R = 1.3 A^{1 / 3} \times 10^{- 15} m,

where

A

is its mass number, evaluate the density of nuclei and the number of nucleons per unit volume of the nucleus. Take mass of one nucleon

= 1.67 \times 10^{- 27} kg

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 5

Find the binding energy of the nucleus of lithium isotope

{}_{3}{Li}^{7}

and hence find the binding energy per nucleon in it.

(M_{3^{Li}} = 7.014353 amu, M_{1^{H^{1}}} = 1.007826,

mass of neutron

= 1.00867 u)

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 6

Find the energy required for separation of a

{}_{10}{Ne}^{20}

nucleus into two

α -

particles and a

{}_{6}C^{12}

nucleus if it is known that the binding energies per nucleon in

{}_{10}{Ne}^{20}, {}_{2}{He}^{4} and {}_{6}C^{12}

nuclei are equal to

8.03, 7.07 and 7.68 MeV

respectively.

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 7

The kinetic energy of an

α -

particle which flies out of the nucleus of a

{Ra}^{226}

atom in radioactive disintegration is

4.78 MeV .

Find the total energy evolved during the escape of the

α -

particle.

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 8

In the decay

{}^{64}{Cu} \to^{64} Ni + e^{+} + ν,

the maximum kinetic energy carried by the positron is found to be

0.680 MeV

(a) Find the energy of the neutrino which was emitted together with a positron of energy

0.180 MeV

(b) What is the momentum of this neutrino in

kg - m s^{- 1}

? Use the formula applicable to photon.

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 9

Beta decay of a free neutron takes place with a half life of

14

\min

. Then find (a) decay constant (b) energy liberated in the process.