Complete the nuclear change: M 12 27 g → β A l → γ . . . .

Recall, during beta decay, a neutron changes to a proton and emits an electron. Thus, the atomic number increases by one while the mass number remains unchanged. Thus, the element aluminium formed will have an atomic number of 13 . When this daughter nucleus undergoes gamma decay, there will be no change in the atomic number. Thus, the element remains unchanged. M 12 27 g → β A 13 27 l → γ A 13 27 l .

Complete the nuclear change: N 11 24 a → β M g

When an element undergoes beta-decay, the mass number remains unchanged but the atomic number increases by one. Therefore, the position of the element formed will advance by one. During this decay, a beta particle is emitted which is a negatively charged electron. Now in the case of N 11 24 a , the proton number increases by 1 , and becomes M 12 24 g . Thus, the reaction is as follows; N 11 24 a → β M 12 24 g

Complete the nuclear change: P Z A → β Q

When an element undergoes beta-decay, the element changes into a new element by emitting an electron. During this decay, the mass number remains unchanged but the atomic number increases by one. Therefore, the position of the element formed will advance by one. Thus, the nuclear change that occurs to an element P is as shown: P Z A → β Q Z + 1 A .

A nucleus of an element P that has a symbol P 84 202 emits an alpha particle and then a beta particle. The final nucleus is D a b . Find the value of a and b .

During alpha decay, the mass number decreases by a factor of 4 and atomic number by a factor of 2 for the element P . During this decay, in order to satisfy the law of conservation of mass and charge, a doubly ionised helium nucleus is also emitted. Then the daughter nucleus undergoes beta decay by emitting beta particles and forming a new element D whose position advances by one as the proton number increases. Thus, the following reaction is as shown. P 84 202 → α X 82 198 → β D 83 198 Thus, the value of a = 83 and b = 198 .

E M B I B E

Self Study in Physics>Chapter 12 - Modern Physics>Expected Questions>Q 6

HARD

10th ICSE

IMPORTANT

Earn 100

Complete the following nuclear equation by filling in the correct values in them.

$P_{92}^{238} \overset{α}{\to} {}_{. . . .}^{. . . .}P_{1} \overset{- β}{\to} {}_{. . . .}^{. . . .}P_{2} \overset{- β}{\to} {}_{. . . .}^{. . . .}P_{3}$

Important Questions on Modern Physics

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10th ICSE

IMPORTANT

Self Study in Physics>Chapter 12 - Modern Physics>Expected Questions>Q 7

A nucleus emits an alpha particle, followed by emission: thereafter it emits two particles to form $X_{3}$ .

${}_{Z}^{A}X \overset{α}{\to} X_{1} \overset{- γ}{\to} X_{2} \overset{- β}{\to} {}_{. . . .}X_{3}$

MEDIUM

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 12 - Modern Physics>Expected Questions>Q 8

Complete the nuclear change:

${}_{12}^{27}M g \overset{β}{\to} A l \overset{γ}{\to} . . . .$

EASY

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 12 - Modern Physics>Expected Questions>Q 8

Complete the nuclear change:

${}_{11}^{24}N a \overset{β}{\to} M g$

EASY

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 12 - Modern Physics>Expected Questions>Q 8

Complete the nuclear change:

${}_{Z}^{A}P \overset{β}{\to} Q$

MEDIUM

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 12 - Modern Physics>Expected Questions>Q 9

A nucleus of an element

P

that has a symbol

{}_{84}^{202}P

emits an alpha particle and then a beta particle. The final nucleus is

{}_{a}^{b}D

. Find the value of

a

and

b

.

EASY

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IMPORTANT

Self Study in Physics>Chapter 12 - Modern Physics>Expected Questions>Q 10

A nucleus of radium

{}_{88}^{229}R a

emits an alpha particle. Represent the change with the help of an equation. Identify the new nucleus from the following:

{}_{84}P a, {}_{85}A t, {}_{86}R n

EASY

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IMPORTANT

Self Study in Physics>Chapter 12 - Modern Physics>Expected Questions>Q 11

A certain nucleus

X

has mass number

14

and atomic number

6

. The nucleus

X

changes to

{}_{7}^{14}Y

after the loss of particle. Name the particle emitted. Represent this change in the form of an equation. A radioactive substance is oxidised. What change would you expect to take place in the nature of its radioactivity? Give a reason for your answer.

EASY

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 12 - Modern Physics>TEST YOURSELF>Q 1

Explain the term work function