Quarks and Leptons - 2

Question 1

What are cosmic rays?

Answer 1

high energy particles that move through space

Question 2

what happens when cosmic rays enter the atmosphere?

Answer 2

these create short lived particles and antiparticles and photons

Question 3

how are pions and kaons made/

Answer 3

in pairs through the strong interaction

Question 4

how must kaons decay?

Answer 4

via the weak interaction

Question 5

are kaons strange?

Answer 5

yes

Question 6

what can a kaon decay into?

Answer 6

pions, muon and antineutrino, antimuon and neutrino

Question 7

what does a pie 0 decay into

Answer 7

high energy photons

Question 8

what does a charged pion decay into?

Answer 8

muon and antineutrino, antimuon and neutrino

Question 9

what does a muon decay into?

Answer 9

electron and antineutrino

Question 10

what does an antimuon decay into?

Answer 10

positron and neutrino

Question 11

what interactions can leptons do ?

Answer 11

weak, gravitational, electromagnetic

Question 12

what interactions can hadrons do?

Answer 12

strong, weak, gravitational, electromagnetic, mostly weak

Question 13

rest energy =

Answer 13

total energy before - ke of products

Question 14

what are the two categories of matter and antimatter

Answer 14

hadrons and leptons

Question 15

what are the two categories of hadrons

Answer 15

baryons and mesons

Question 16

difference between baryons and mesons?

Answer 16

mesons have no protons in their decay

Question 17

do leptons have quarks

Answer 17

no

Question 18

do hadrons have quarks

Answer 18

yes

Question 19

what are mesons made from

Answer 19

quark and antiquark

Question 20

what are baryons made from

Answer 20

three quarks

Question 21

is the lepton number always conserved

Answer 21

yes

Question 22

name a strange particle?

Answer 22

kaon

Question 23

how do you calculate the energy of a photon

Answer 23

E=Hf

Question 24

which fundamental interaction is responsible for electron capture?

Answer 24

weak interaction - w- boson is the mediator

Question 25

what is the quark structure of a proton

Answer 25

uud

Question 26

what is the quark structure of a neutron

Answer 26

udd

Question 27

what is the exchange particle for the strong nuclear force?

Answer 27

pion

Question 28

what is the exchange particle for the weak nuclear force?

Answer 28

w bosons

Question 29

how does the strong nuclear force maintain stability?

Answer 29

keeps an equilibrium distance

Question 30

what is the strangeness of an anti strange quark?

Answer 30

1

Question 31

when is strangeness conserved?

Answer 31

in strong interactions but not weak