Particles and Antiparticles

Which equation shows the process of annihilation?

• π⁻ + π → γ

• 
• β⁻ + p → γ

• γ + γ → β⁺ + β⁻

Tags

NGSS.HS-PS1-8

What is an antiparticle? Choose the best definition.

• Dark matter

• Potato matter

• A particle with opposing charge but the same mass and spin as its opposite particle

• A cross between a lepton and a quark

• A Particle with no charge with negative mass and opposite spin, containing dark matter and effectively being the opposite of that said particle.

The _ _ _ _ _ _ is the carrier of the electromagnetic force.

Fluoride ions are produced by the addition of a single electron to an atom of fluorine ¹⁹₉F

What is the magnitude of specific charge of the fluoride ion?

• 3.2 × 10^–26 C kg^–1

• 8.4 × 10^–21 C kg^–1

• 5.0 × 10⁶ C kg^–1

• 4.5 × 10⁷ C kg^–1

Tags

NGSS.HS-PS2-4

When a nucleus of the radioactive isotope ⁶⁵₂₈Ni decays, a β^– particle and an electron antineutrino are emitted.

How many protons and neutrons are there in the resulting daughter nucleus?

• Number of protons: 28

  Number of neutrons: 65

• Number of protons: 29

  Number of neutrons: 65

• Number of protons: 28

  Number of neutrons: 36

• Number of protons: 30

  Number of neutrons: 35

Tags

NGSS.HS-PS1-8

An atom of ¹⁶₇N gains 3 electrons.

What is the specific charge of the ion?

• 1.80 × 10⁷ C kg^–1

• –1.80 × 10⁷ C kg^–1

• 4.19 × 10⁷ C kg^–1

• –4.19 × 10⁷ C kg^–1

Electrons moving in a beam have the same de Broglie wavelength as protons in a separate beam moving at a speed of 2.8 × 10⁴ m s^–1.

What is the speed of the electrons?

• 1.5 × 10¹ m s^–1

• 2.8 × 10⁴ m s^–1

• 1.2 × 10⁶ m s^–1

• 5.1 × 10⁷ m s^–1

Tags

NGSS.HS-PS4-1

The composition of a carbon dioxide (CO₂) molecule is one atom of ¹²₆C and two atoms of ¹⁶₈O.

What is the number of molecules of CO₂ in 2.2 kg of the gas?

• 1.0 × 10²²

• 3.0 × 10²²

• 3.0 × 10²⁵

• 4.7 × 10²⁵

Tags

NGSS.HS-PS1-7

Which of the following nuclei has the smallest specific charge?

• 
• 
• 
• 

Which list puts the forces in order of increasing magnitude?

• 2 pN < 2 fN < 2 TN < 2 GN

• 2 pN < 2 fN < 2 GN < 2 TN

• 2 fN < 2 pN < 2 TN < 2 GN

• 2 fN < 2 pN < 2 GN < 2 TN

Tags

NGSS.HS-PS2-4