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.

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The positron is antiparticle of

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Important Questions on Atomic Structure and Particle Physics

EASY

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

The particles not emitted by radioactive substance are

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):

HARD

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?

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EASY

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

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

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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

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:

EASY

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 sample of $^{210} P o$ which is $α$ - emitter with $T_{\frac{1}{2}} = 138$ days is observed by a student to have 2000 disintegrations (2000 Bq). What is the mass of the $^{210} P o$ sample ?