P2 - Particles and Radiation

Question 1

What is the specific charge?

Answer 1

Charge to masss ratio

Question 2

Which letter denotes proton number?

Answer 2

Z

Question 3

Which letter denotes nucleon number?

Answer 3

A

Question 4

What does the strong force do?

Answer 4

Keep the nuclei stable by counteracting the electrostatic force of repulsion between protons in the nucleus.

Question 5

What is annihilation?

Answer 5

Particle-antiparticle collision where their masses are converted into energy released as gamma photons.

Question 6

What is pair production?

Answer 6

A high energy photon converted into a particle-antiparticle pair

Question 7

What is the exchange particle in the strong interaction?

Answer 7

Gluon

Question 8

What is the exchange particle in the weak force?

Answer 8

W-/W+ boson

Question 9

What is the range of the weak force?

Answer 9

10^-18

Question 10

Which particles does the strong force act on?

Answer 10

Hadrons

Question 11

Which particles does the weak force act on?

Answer 11

All particles

Question 12

Which particles does the EM force act on?

Answer 12

All charged particles

Question 13

Which particles does the gravity force act on?

Answer 13

All particles with mass.

Question 14

Which interactions is the wear force responsible for?

Answer 14

Beta decay, electron capture, electron-proton collisions.

Question 15

What is the equation and particle for electron capture?

Answer 15

p + e- >(W+)> n+Ve

Question 16

What is the equation and particle for electron proton collisions?

Answer 16

p + e- <(W-)< n+Ve

Question 17

What is the equation and particle for beta plus decay?

Answer 17

p > n + (e+) + Ve

Question 18

What is the equation and particle for beta minus decay?

Answer 18

n >W-> p + e + AntiVe

Question 19

When must strangeness be conserved?

Answer 19

During strong interactions ONLY

Question 20

What is the photoelectric effect?

Answer 20

Where photoelectrons are emitted from the surface of a metal after light above the threshold frequency is shone on it.

Question 21

Which light theory does the photoelectric effect disprove?

Answer 21

The wave theory.

Question 22

What does the particle theory of light suggest?

Answer 22

• EM waves travel in packets (photons)
• Each electron can absorb a single photon
• Increasing intensity of light increases the amount of photons released.

Question 23

What is the work function?

Answer 23

The minimum energy needed to release electrons from the surface of a metal.

Question 24

What is the stopping potential of a metal?

Answer 24

The maximum PD you would need to apply across the metal to stop the particles with the maximum kinetic energy.

Question 25

How do you get a line spectrum?

Answer 25

Pass light form a fluorescent tube through a diffraction grating.

Question 26

What kind of spectrum is discrete?

Answer 26

Line spectrum

Question 27

What kind of spectrum is continuous?

Answer 27

Absorption spectrum

Question 28

What is an example of light acting as a wave?

Answer 28

Diffraction and interference

Question 29

What is an example of light acting as a particle?

Answer 29

Photoelectric effect

Question 30

When do you use de Broglie wavelengths?

Answer 30

When you are told the mass