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.

Masses of two isobars 29 Cu 64 and 30 Zn 64 are 63.9298 u and 63.9292 u respectively. It can be concluded from these data that :

Cu 64 is radioactive, decaying to Zn 64 through β - decay

Zn 64 is radioactive, decaying to Cu 64 through β - decay

Zn 64 is radioactive, decaying to Cu 64 through γ - decay

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The positron is antiparticle of

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Important Questions on Atomic Structure and Particle Physics

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

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

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

The particles not emitted by radioactive substance are

MEDIUM

Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

In a radioactive decay chain, the initial nucleus is

_{90}^{232} Th

. At the end, there are

6

α

-particles and

4 β

-particles which are emitted. If the end nucleus is

_{Z}^{A} X, A

and

Z

are given by:

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

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

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

During a

β

- decay

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

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

HARD

Physics>Atomic Structure>Atomic Structure and Particle Physics>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):

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

Which of the following is a correct statement?

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

Assertion: Most of the heavy element emit

α

and

β

particles simultaneously.

Reason: Heavy element contain comparatively larger number of neutrons then protons.

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

During a negative decay:

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

Masses of two isobars ₂₉Cu⁶⁴ and ₃₀Zn⁶⁴ are 63.9298 u and 63.9292 u respectively. It can be concluded from these data that :

MEDIUM

Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

_{86} A^{222} \to_{84} B^{210}

, in this reaction how many

α

and

β

particles are emitted?

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

Assertion: The ionizing power of

β -

-particle is less compared to

α -

-particle but their penetrating power is more.

Reason: The mass of

β -

particle is less than the mass of

α -

particle.

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

The radiations from a naturally occurring radioactive substance, as seen after deflection by a magnetic field in one direction are:

HARD

Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

A radioactive sample has an initial concentration

N_{0}

of nuclei. Then,

EASY

Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

It is observed that only

0.39 %

of the original radioactive sample remains un decayed after eight hours. Hence

HARD

Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

In which of the following decays the atomic number decreases?

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

Assertion: A free neutron is not a stable particle.

Reason: It decay spontaneously into a proton, an electron and an antineutrino.

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

Assertion: In

β -

decay, antinutrino is emitted.

Reason: Antinutrino is emitted due to conservation of linear momentum.

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Physics>Atomic Structure>Atomic Structure and Particle Physics>Radioactivity

Assertion: For pair production, energy of

γ

ray is greater than 1.02 MeV.

Reason: In pair production, energy is converted into mass.

The positron is antiparticle of

Important Questions on Atomic Structure and Particle Physics

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