Particle Physics

Question 1

Describe with evidence the deduction made from the alpha particle scattering experiment.

Answer 1

Most alpha particles passed straight showing that it is an empty space.
Some deflected by small angles showing that the nucleus is positive
Some deflect by large angles showing that he nucleus is very small and this is where the mass and charge is concentrated

Question 2

What are the three types of decay?

Answer 2

Alpha decay
Beta decay
Gamma decay

Question 3

How alpha decay change the element?

Answer 3

Proton number decreases by 2

Nucleon number decreases by 4

Question 4

B- decay

Answer 4

Neutron decays to form a proton, electron and antineutrino

Proton number increase by 1.

Question 5

B+ decay

Answer 5

When a proton decays into a neutron, positron and neutrino

Question 6

Antimatter

Answer 6

All particles have a corresponding antiparticle which have the same mass but opposite charge

Question 7

What is the antimatter for an electron?

Answer 7

Positron

Question 8

Which particles are fundamental particles?

Answer 8

All leptons:
Electrons
positrons
Neutrinos
antineutrinos

Question 9

How many quarks do baryons have

Answer 9

3

Question 10

Give examples of baryons

Answer 10

proton
antiproton
neutron
antineutron

Question 11

How many quarks do mesons have?

Answer 11

2

Question 12

Meson composition

Answer 12

Quark and an antiquark

Question 13

Baryon composition

Answer 13

One yeilding a whole number i.e -1,0,1

Question 14

Quark composition of a proton

Answer 14

UUD

Question 15

Quark composition of a neutron

Answer 15

UDD

Question 15

Quark composition of a neutron

Answer 15

UDD