In the decay sequence: U 92 238 → - x 1 Th 90 234 → - x 2 Pa 91 234 → - x 3 Z 234 → - x 4 Th 90 234 x 1 , x 2 , x 3 and x 4 are the particles/ radiation emitted by the respective isotopes. The correct option(s) is/are:

x 1 will deflect towards the negatively charged plate.

Is it possible for a hydrogen ( H 1 1 ) nucleus to emit an alpha particle? Give a reason for your answer.

No, as alpha radiation is nothing but the nucleus of helium ( H 2 4 e ). With the emission of an alpha particle ( H 2 4 e ), the atomic number of the radioactive nucleus decreases by two and mass number by four. The nucleus of hydrogen does not contain two protons and two neutrons, and it has less number of electrons than the alpha particle. So it can not emit an alpha particle.

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A nucleus $X$ captures a $β$ particle and then emits a neutron and $γ$ ray to form $Y . X$ and $Y$ are:-

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Important Questions on Nuclear Energy

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Physical Science>Physics>Nuclear Energy>Radioactivity

^{227} A c

has a half-life of 22 years with respect to radioactive decay. The decay follows two parallel paths:

^{227} Ac \to^{227} T h

and

^{227} Ac \to^{223} F r

. If the percentage of the two daughter nuclides are

2.0

and

98.0

, respectively the decay constant (in

y e a r^{- 1}

) for

^{227} Ac \to^{227} T h

path is closest to

HARD

Physical Science>Physics>Nuclear Energy>Radioactivity

A plot of the number of neutrons

(N)

against the number of protons

(P)

of the stable nuclei exhibits upwards deviation from linearity for atomic number,

Z > 20

. For an unstable nucleus having

\frac{N}{P}

ratio less than

1

, the possible mode(s) of decay is (are):

EASY

Physical Science>Physics>Nuclear Energy>Radioactivity

The product obtained after a positron emission from

{}_{31}{Ga}^{68}

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Physical Science>Physics>Nuclear Energy>Radioactivity

In the decay sequence:

${}_{92}^{238}U \overset{- x_{1}}{\to} {}_{90}^{234}{Th} \overset{- x_{2}}{\to} {}_{91}^{234}{Pa} \overset{- x_{3}}{\to} {}^{234}Z \overset{- x_{4}}{\to} {}_{90}^{234}{Th}$

$x_{1}, x_{2}, x_{3}$ and $x_{4}$ are the particles/ radiation emitted by the respective isotopes. The correct option(s) is/are:

EASY

Physical Science>Physics>Nuclear Energy>Radioactivity

From which part of the atom are the radioactive rays emitted? Which of the radioactive rays has the highest penetrating power, and which has the highest ionising power?

HARD

Physical Science>Physics>Nuclear Energy>Radioactivity

In the nuclear transmutation

_{4}^{9} Be + X ⟶_{4}^{8} Be + Y

, identify

(X, Y)

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Physical Science>Physics>Nuclear Energy>Radioactivity

The particles emitted during the sequential radioactive decay of

{}^{238}U_{92}

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

are

EASY

Physical Science>Physics>Nuclear Energy>Radioactivity

The decay constant which is the reciprocal of the time duration for which the number of the atoms of radioactive substance falls to

EASY

Physical Science>Physics>Nuclear Energy>Radioactivity

Which radioactive ray is composed of negatively charged particles?

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Physical Science>Physics>Nuclear Energy>Radioactivity

In the radioactive decay process

Question Image

1. A and B are isobars

2. A and D are isotopes

3. C and D are isobars

4. A and C are isotopes

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Physical Science>Physics>Nuclear Energy>Radioactivity

A bacterial infection in an internal wound grows as

N^{'} (t) = N_{0} e x p (t)

, where the time

t

is in hours. A dose of antibiotic, taken orally, needs 1 hour to reach the wound. Once it reaches there, the bacterial population goes down as

\frac{d N}{d t} = - 5 N^{2}

. What will be the plot of

\frac{N_{0}}{N}

t

after

1

hour?

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Physical Science>Physics>Nuclear Energy>Radioactivity

A nucleus

{}_{84}X^{202}

of an element emits an alpha particle followed by a beta particle. The final nucleus is

{}_{a}Y^{b}

. Find a and b.

HARD

Physical Science>Physics>Nuclear Energy>Radioactivity

{}_{92}^{238}U

is known to undergo radioactive decay to form

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

by emitting alpha and beta particles. A rock initially contained

68 \times 10^{- 6} g

{}_{92}^{238}U

. If the number of alpha particles that it would emit during its radioactive decay of

{}_{92}^{238}U

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

in three half-lives is

Z \times 10^{18}

, then what is the value of

Z

EASY

Physical Science>Physics>Nuclear Energy>Radioactivity

In the radioactive disintegration series

_{90}^{232} T h \to_{82}^{208} P b,

involving

α

and

β

decay, the total number of

α

and

β

particles emitted are

EASY

Physical Science>Physics>Nuclear Energy>Radioactivity

Consider, the radioactive disintegration

{}_{82}A^{210} \to B \to C \to {}_{82}D^{206}

The sequence of emission can be

EASY

Physical Science>Physics>Nuclear Energy>Radioactivity

If the quantity of a radioactive element is doubled, the rate of disintegration will

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Physical Science>Physics>Nuclear Energy>Radioactivity

The ratio of the binding energies of three nuclei is

1 : 4 : 9

. If the ratio of their nuclear radii is

1 : 2 : 3

, the nuclei in the decreasing order of the stability can be arranged as

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Physical Science>Physics>Nuclear Energy>Radioactivity

{}_{93}^{239}{Np}

is a

β

-emitter, but the product is also radioactive and give

{}^{235}U

. Which particle(s) is/are emitted by the product?

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Physical Science>Physics>Nuclear Energy>Radioactivity

Write three important properties of beta particles.

EASY

Physical Science>Physics>Nuclear Energy>Radioactivity

Is it possible for a hydrogen (

{}_{1}^{1}H

) nucleus to emit an alpha particle? Give a reason for your answer.

A nucleus X captures a β particle and then emits a neutron and γ ray to form Y. X and Y are:-

Important Questions on Nuclear Energy

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A nucleus $X$ captures a $β$ particle and then emits a neutron and $γ$ ray to form $Y . X$ and $Y$ are:-