Particle Physics Flashcards

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1
Q

The charge of a proton in Coulombs

A

1.6 x 10^-19

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2
Q

Annihilation

A

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

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3
Q

Electron capture

A

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

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4
Q

Isotopes

A

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

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5
Q

(Strong force interaction)

  1. closer than 3 fm
  2. closer than 0.4 fm
  3. greater than 3 fm
A
  1. Attracts really strongly
  2. Repels
  3. attract weakly
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6
Q

Kaon decay into

A

pion

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7
Q

During strong interaction

A

strangness need to be conserve

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8
Q

eV —-> J

A

x 1.6 (10^ -19)

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9
Q

J —-> eV

A

/ 1.6 (10^ -19)

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10
Q
Exchange particle
(Use)
A

Particle that mediate the four fundamental force

Hold particles together and inpart force

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11
Q

Four fundamental force

A

Electromagnetic force , Strong force , weak force and gravity

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12
Q
Cloud chamber (highly ionising alpha particles) 
Y?
A

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

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13
Q

Cloud chamber (ionising beta particles)

A

Thin , straight or curved tracks

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14
Q

Cloud chamber ( weakly gamma rays)

A

left no tracks at all

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15
Q

Exchange particle of strong force

A

gluon

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16
Q

Exchange particle of weak force

A

W+ ,W-

17
Q

Exchange particle of electromanetic force

A

photon

18
Q

pion made of ………..quarks

A

u ,d , anti-u , ant-d

19
Q

Specific charge

A

charge/mass (Ckg^-1)

20
Q

Ions

A

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

21
Q

All baryons eventually decay into…

A

Proton (it is the only stable baryon )

22
Q

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

A

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