A neutron in the nucleus decays emitting an electron.

A proton in the nucleus decays emitting an electron.

An electron which is already present within the nucleus is ejected.

MEDIUM

Earn 100

A nucleus of an element ${}_{84}X^{202}$ emits an $α$ -particle first, $β$ -particle next and then a gamma photon. The final nucleus formed has an atomic number.

50% studentsanswered this correctly

Important Questions on Nuclear Physics

HARD

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

Originally the radioactive beta decay was thought as a decay of a nucleus with the emission of electrons only (Case I) . However, in addition to the electron, another (nearly) massless and electrically neutral particle is also emitted (Case II). Based on the figure below, which of the following is correct?

Question Image

MEDIUM

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

{}_{90}^{232}{Th}

emits

6 α

and

4 β

particles and gets converted into a lead. The mass number and atomic number of lead is _____

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

Assertion (A) : Neutrino is chargeless and possesses spin.

Reason $(R) :$ Neutrino exists inside the nucleus.

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then:

HARD

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

Carbon $- 11$ decays to boron $- 11$ according to the following formula: ${}_{6}^{11}C \to {}_{5}^{11}B + e^{+} + v_{e} + 0.96 MeV$ .
Assume that positrons $(e^{+})$ produced in the decay combines with free electrons in the atmosphere and annihilate each other almost immediately. Also, assume that the neutrinos $(v_{e})$ are massless and do not interact with the environment. At $t = 0$ , we have $1 μg$ of ${}_{6}^{12}C$ . If the half-life of the decay process is $t_{0}$ , the net energy produced between time, $t = 0$ and $t = 2 t_{0}$ will be nearly,

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

The decay of a proton to neutron is :

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

During a

β

- decay

MEDIUM

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

A radioactive nucleus

\begin{matrix} A \\ Z \end{matrix} X

undergoes spontaneous decay in the sequence

\begin{matrix} A \\ Z \end{matrix} X \to \begin{matrix} (Z - 1) \end{matrix} B \to \begin{matrix} (Z - 3) \end{matrix} C \to \begin{matrix} (Z - 2) \end{matrix} D

, where

Z

is the atomic number of element

X

. The possible decay particles in the sequence are:

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

The end product of decay of

_{90} {Th}^{232}

_{82} {Pb}^{208}

. The number of

α

and

β

particles emitted are respectively

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

The number of

α

-particles emitted during the radioactive decay chain from

{}_{88}^{226}{Ra}

and ending at

{}_{82}^{206}{Pb}

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

In radioactive reaction,

${}_{Z}^{A}X \to {}_{Z + 1}^{A}X_{1} \to {}_{Z + 2}^{A}X_{2} \to {}_{Z}^{A - 4}X_{3} \to {}_{Z + 1}^{A - 4}X_{4}$

Radioactive radiation are emitted in the sequence:

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

A decay chain of the nucleus

{}_{92}^{238}U

involves eight

α

-decays and six

β

-decays. The final nucleus at the end of the process will be

MEDIUM

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

{}_{92}{U^{238}}

changes to

{}_{85}{At}^{210}

by a series of

α

- and

β

-decays, the number of

α

- and

β

-decays undergone, respectively, is

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

The atomic number and the mass number of an atom remains unchanged when it emits

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

Which one of the following is

NOT

emitted by radioactive elements?

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

{}_{10}^{22}{Ne}

nucleus decays into two

α

-particles and an unknown nucleus. The unknown nucleus is

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

In a gamma ray emission from nucleus

:

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

What happens to the mass number and atomic number of an element when it emits

γ

-radiation

EASY

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

A nuclear decay is possible if the mass of the parent nucleus exceeds the total mass of the decay particles. If

M (A, Z)

denotes the mass of a single neutral atom of an element with mass number A and atomic number Z, then the minimal condition that the

β

decay,

X_{Z}^{A} \to Y_{Z + 1}^{A} + β^{-} + \bar{v_{e}}

, will occur is (

m_{e}

denotes the mass of the

β

particle and the neutrino mass

m_{v}

can be neglected):

MEDIUM

Physics>Modern Physics>Nuclear Physics>α, β and γ Radiations

The beta particles of a radioactive metal originate from-

A nucleus of an element X20284 emits an α -particle first, β -particle next and then a gamma photon. The final nucleus formed has an atomic number.

Important Questions on Nuclear Physics

Learn and Prepare for any exam you want !

A nucleus of an element ${}_{84}X^{202}$ emits an $α$ -particle first, $β$ -particle next and then a gamma photon. The final nucleus formed has an atomic number.