Atomic Structure and Radioactivity - SS1 Physics Past Questions and Answers - page 4

31

Discuss the limitations of the Bohr Model and the development of Quantum Mechanics. 

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32

Radioactivity is the spontaneous emission of:

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A

Electrons

 

B

Protons

 

C

Alpha particles

 

D

Neutrons

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33

The process in which an unstable atomic nucleus emits an alpha particle is known as:

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A

Alpha decay

 

B

Beta decay

 

C

Gamma decay

 

D

Nuclear fission

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34

The half-life of a radioactive substance is defined as the time it takes for:

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A

Half of the substance to decay

 

B

All of the substance to decay

 

 

C

One-fourth of the substance to decay

 

D

None of the above

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35

Beta decay involves the emission of:

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A

Protons

 

B

Electrons

 

C

Neutrons

 

 

D

Alpha particles

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36

Gamma radiation is:

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A

A stream of protons

 

B

A stream of electrons

 

 

C

High-energy electromagnetic radiation

 

D

The emission of alpha particles

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37

The process in which a heavy nucleus splits into two smaller nuclei is called:

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A

Alpha decay

 

 

B

Beta decay

 

C

Gamma decay

 

D

Nuclear fission

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38

The decay of a radioactive substance follows a:

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A

Linear pattern

 

 

B

Exponential pattern

 

C

Logarithmic pattern

 

D

Random pattern

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39

Radioactive isotopes are used in:

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A

Medical imaging

 

B

Power generation

 

C

Carbon dating

 

D

All of the above

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40

The unit used to measure the amount of radioactivity is:

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A

Watt

 

B

Coulomb

 

C

Becquerel

 

D

Ampere

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