particle ( LEPTONS AND BARYONS )

Question 1

what does a koan decay into

Answer 1

pion muon neutrino antineutriono

Question 2

what does pion decay into

Answer 2

muon antimuon neutrion antineutrino

Question 3

what does muon decay into

Answer 3

electron anitneutrino

Question 4

what are baryons made up off

Answer 4

3 quarks

Question 5

what are meson made up off

Answer 5

anti quark and quark

Question 6

what is conserved in an interaction

Answer 6

lepton number baryon number and charge

Question 7

what are antiparticle

Answer 7

they are corresponding particle with same mass and opposite charge

Question 8

baryon charge for up down and strange

Answer 8

up = 2/3 down = -1/3 strange = -1/3

Question 9

what does anti muon decay into

Answer 9

positron and neutrino

Question 10

what are pion and koan

Answer 10

both are mesons

Question 11

what is conserved

Answer 11

energy momentum and charge are conserved for the decay to happen

Question 12

what are baryons

Answer 12

anything that decays into a proton example proton and neutron

Question 13

when is a pion released

Answer 13

when a proton is released

Question 14

what interaction does hadron go through

Answer 14

strong weak electromagnetic and gravity

Question 15

what interaction does leptons go through

Answer 15

gravity weak and electromagnetic

Question 16

example of hadron

Answer 16

pion kaon proton and neutrons

Question 17

example of lepton

Answer 17

electron and neutrinos

Question 18

when is strangeness conserved

Answer 18

strong interaction

Question 19

what role does exchange particle play

Answer 19

they transfer energy and momentum to the other particle

Question 20

what happens to mass and atomic number in alpha decay

Answer 20

mass number decreases by 4 atomic number decreases by 2 ( atomic number is number of proton)

Question 21

what happens to atomic and mass number in beta decay

Answer 21

mass number stays the same atomic number decreases by 1

Question 22

what is udd

Answer 22

neutrons

Question 23

what interation happens with the w-

Answer 23

weak interaction

Question 24

state the class of particle that the w- belongs to

Answer 24

bosons

Question 25

particles that are produced when a muon decays

Answer 25

electro an electron antineutrino and muon neutrino

Question 26

Describe the interaction that is responsible for keeping protons and neutrons together
in a stable nucleus.
You should include details of the properties of the interaction in your answer

Answer 26

the strong interaction is responsible for keeping them together
has an attraction up to 1 to 5 femtometres and repulsive below 1 and above 5
only affects hadrons so baryons and mesons

Question 27

Nuclei can decay by alpha decay and by beta decay.
In alpha decay only one particle is emitted but in beta decay there are two emitted
particles.
Explain how baryon number is conserved in alpha and beta decay.

Answer 27

in alpha decay the number of neutrons and protons are unchanged so baryon does not change

where as in beta decay a neutron changes into a proton and both of them have the same baryon number

Question 28

There have been considerable advances in our understanding of particle physics over
the past 100 years.
Explain why it is necessary for many teams of scientists and engineers to collaborate
in order for these advances to be made.

Answer 28

results and data has to checked by other scientist before they can be accepted

many skills and discipline are required which one team are unlikely to have

particle accelerators are very expensive so working together helps spread the cost out

Question 29

Which is an exchange particle of the strong nuclear force?

Answer 29

pion

Question 30

A polonium-210 nucleus is formed when a stationary nucleus of bismuth-210 decays.
A beta-minus (β−
) particle is emitted in this decay.
Outline, with reference to β− decay, why bismuth-210 and polonium-210 have different
proton numbers.

Answer 30

a neutron turns into a proton
proton number increases by 1 so polonium would have one more proton than bismuth

Question 31

what can use used to detect beta particle

Answer 31

cloud chamber