Particles (Unit 1)

Question 1

What happens when a particle and antiparticle come together?

Answer 1

-they annihilate

Question 2

Leptons?

Answer 2

electrons and electron-neutrinos

Question 3

Hadrons?

Answer 3

particles consisting of quarks or antiquarks bound together

Question 4

Baryon

Answer 4

a hadron consisting of 3 quarks or 3 antiquarks.

Question 4

Baryon

Answer 4

a hadron consisting of 3 quarks or 3 antiquarks.

Question 5

Meson

Answer 5

a hadron consisting of a quark-antiquark pair.

Question 6

What is exclusive to weak reactions?

Answer 6

neutrino involvement and quark flavour changes

Question 7

Strong forces?

Answer 7

• experienced by : all quarks, so all hadrons
  -range : short

Question 8

EM force?

Answer 8

• experienced :all charged particles
  range : infinite
  (also experienced by neutral hadrons, as these are composed of quarks)

Question 9

weak

Answer 9

-experienced : all
-range: infinite

Question 10

gravitational

Answer 10

-All matter
-infinite
-very weak – negligible except between large objects such as planets (ignore for particles)

Question 11

Charge Number? (for element)

Answer 11

-number of protons (bottom number)

Question 12

Baryon number? (for element)

Answer 12

number next to name of atom (baryon 14)