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In an $α$ -decay the kinetic energy of $α$ -particle is $48 MeV$ and $Q$ -value of the reaction is $50 MeV$ . The mass number of the mother nucleus is (assume that daughter nucleus is in ground state)

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Important Questions on Nuclear Physics

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 2

A sample of radioactive material decays simultaneously by two processes

A

and

B

with half lives

\frac{1}{2}

and

\frac{1}{4} hr

, respectively. For first half hour it decays with the process

A,

next one

hr

with the process

B

and for further half an hour with both

A

and

B

. If originally there were

N_{0}

nuclei, find the number of nuclei after

2 hr

of such decay.

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 3

In which of the following process the number of protons in the nucleus increases.

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 4

A radioactive nucleus

' X'

' decays to a stable nucleus

' Y' .

Then the graph of rate of formation of

' Y'

' against time

' t'

' will be

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 5

A heavy nucleus having mass number

200

gets disintegrated into two small fragments of mass number

80

and

120 .

If binding energy per nucleon for parent atom is

6.5 MeV

and for daughter nuclei is

7 MeV

and

8 MeV

, respectively, then the energy released in the decay will be

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 6

An element

X

decays, first by positron emission and then two

α

-particles are emitted in successive radioactive decay. If the product nuclei has a mass number

229

and atomic number

89,

the mass number and atomic number of element

X

are

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 7

When an electron accelerated by potential difference $U$ is bombarded on a specific metal, the emitted $X$ -ray spectrum obtained is shown in adjoining graph. If the potential difference is reduced to $\frac{U}{3},$ the correct spectrum is

Question Image

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 8

90 %

of a radioactive sample is left undecayed after time

t

has elapsed. What percentage of the initial sample will decay in a total time

2 t

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 9

A radioactive element

X

converts into another stable element

Y

. Half life of

X

2 hrs

. Initially only

X

is present. After time

t

, the ratio of atoms of

X

and

Y

is found to be

1 : 4

, then

t

in hours is

In an α -decay the kinetic energy of α-particle is 48 MeV and Q -value of the reaction is 50 MeV. The mass number of the mother nucleus is (assume that daughter nucleus is in ground state)

Important Questions on Nuclear Physics

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In an $α$ -decay the kinetic energy of $α$ -particle is $48 MeV$ and $Q$ -value of the reaction is $50 MeV$ . The mass number of the mother nucleus is (assume that daughter nucleus is in ground state)