Particle Physics

Question 1

The charge of a proton in Coulombs

Answer 1

1.6 x 10^-19

Question 2

Annihilation

Answer 2

When matter and antimatter interact , a pair of photons will be emitted.

Question 3

Electron capture

Answer 3

When proton of nucleus interact with shell electron to make neutron.

Question 4

Isotopes

Answer 4

An atom of the same element with the same number of proton but a different nucleon number or number of neutron.

Question 5

(Strong force interaction)

1. closer than 3 fm
2. closer than 0.4 fm
3. greater than 3 fm

Answer 5

1. Attracts really strongly
2. Repels
3. attract weakly

Question 6

Kaon decay into

Answer 6

pion

Question 7

During strong interaction

Answer 7

strangness need to be conserve

Question 8

eV —-> J

Answer 8

x 1.6 (10^ -19)

Question 9

J —-> eV

Answer 9

/ 1.6 (10^ -19)

Question 10

Exchange particle
(Use)

Answer 10

Particle that mediate the four fundamental force

Hold particles together and inpart force

Question 11

Four fundamental force

Answer 11

Electromagnetic force , Strong force , weak force and gravity

Question 12

Cloud chamber (highly ionising alpha particles) 
Y?

Answer 12

Broad , straight and definite tracks ( alpha particle is bigger that electron and having double charge , so it is more ionising )

Question 13

Cloud chamber (ionising beta particles)

Answer 13

Thin , straight or curved tracks

Question 14

Cloud chamber ( weakly gamma rays)

Answer 14

left no tracks at all

Question 15

Exchange particle of strong force

Answer 15

gluon

Question 16

Exchange particle of weak force

Answer 16

W+ ,W-

Question 17

Exchange particle of electromanetic force

Answer 17

photon

Question 18

pion made of ………..quarks

Answer 18

u ,d , anti-u , ant-d

Question 19

Specific charge

Answer 19

charge/mass (Ckg^-1)

Question 20

Ions

Answer 20

Atom that have lost or gained electrons
Lost electron—–positive ions
Gain electron—–negative ions

Question 21

All baryons eventually decay into…

Answer 21

Proton (it is the only stable baryon )

Question 22

During pair production ,if the photon energy is greater than the rest mass of an electron and a positron , what will happen ?

Answer 22

Any excess energy (i.e grater than the rest mass of electron and positron ) will become kinetic energy of electron and positron .