As Nuclear Physics Flashcards

1
Q

What was fired at the gold foil in the Geiger-Marsden experiment?

A

alpha (α) particles

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2
Q

What did most alpha particles do?

A

Passed through the foil

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3
Q

What did a few alpha particles do?

A

Deflected at large angles or bounced back

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4
Q

What was concluded about the atom from this experiment?

A

Most of the atom is empty space, and the nucleus is small, dense, and positively charged

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5
Q

What is the nucleon number (A)?

A

The total number of protons and neutrons

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6
Q

What is the proton number (Z)?

A

The number of protons in the nucleus

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7
Q

What is an isotope?

A

Atoms of the same element with different numbers of neutrons

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8
Q

What is the simple model of an atom?

A

A nucleus made of protons and neutrons with electrons moving around it

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9
Q

What quantities are conserved in a nuclear process?

A

Nucleon number, proton number, and mass-energy

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10
Q

What does it mean that radioactive decay is random?

A

It is impossible to predict when a nucleus will decay

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11
Q

What does it mean that radioactive decay is spontaneous?

A

It is not affected by temperature, pressure, or other external factors

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12
Q

What is an alpha (α) particle?

A

A helium nucleus with 2 protons and 2 neutron

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13
Q

What is a beta (β) particle?

A

A fast-moving electron (β⁻) or positron (β⁺)

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14
Q

What is a gamma (γ) ray?

A

Electromagnetic radiation with no charge or mass

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15
Q

Which radiation has the highest ionizing power?

A

Alpha (α)

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16
Q

Which radiation is the most penetrating?

A

Gamma (γ)

17
Q

What happens in alpha (α) decay?

A

The nucleus loses 2 protons and 2 neutrons

18
Q

What happens in beta-minus (β⁻) decay?

A

A neutron turns into a proton, and an electron is emitted

19
Q

What happens in beta-plus (β⁺) decay?

A

A proton turns into a neutron, and a positron is emitted

20
Q

What happens in gamma (γ) decay?

A

The nucleus releases energy without losing particles

21
Q

What is a fundamental particle?

A

A particle that cannot be broken down into smaller parts

22
Q

Are protons and neutrons fundamental particles?

A

No, they are made of quarks

23
Q

What are the two main quarks in protons and neutrons?

A

Up (u) and Down (d) quarks

24
Q

What is the charge of an up quark?

25
Q

What is the charge of a down quark?

26
Q

What is the quark composition of a proton?

A

2 up quarks + 1 down quark

27
Q

What is the quark composition of a neutron?

A

1 up quark + 2 down quarks

28
Q

What are hadrons?

A

Particles made of quarks

29
Q

What are leptons?

A

Fundamental particles like electrons

30
Q

What are baryons?

A

Hadrons made of 3 quarks, such as protons and neutrons

31
Q

What are mesons?

A

Hadrons made of 1 quark and 1 antiquark

32
Q

What is an antiparticle?

A

A particle with the same mass but opposite charge of its corresponding particle