Topic 7 Flashcards

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1
Q

Alfa particle/ 1 product from alfa radiation

A

4 2+
He
2

Helium NUCLEUS

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2
Q

Beta minus gives

A

0
e (e-) + antineutrino ( ̅νe)
-1

n → p+ + e- + ̅νe

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3
Q

Beta plus gives

A

0
e (positron/”anti-electron”) + (electron-)neutrino (νe)
+1

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4
Q

Gamma reaction

A

e.g.
234 X
Th
90

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5
Q

Rank the following in descending order of ability to cause ionization: alfa particle, beta particle, gamma particle, neutrino

A
  1. (Highest). Alfa (lots of charge, grab electrons, don’t penetrate long but ionizes a lot)
  2. Beta (has to collide to knock out electron)
  3. Gamma (has to have direct collision)
  4. Netrino (none!)
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6
Q

What happens to Alfa beta gamma in magnetic field?

A

Gamma = NOTHING! Has no charge
Alfa = bends, larger radius than beta since much larger mass, opp direction beta
Beta = bends, a lot more/smaller radius than Alfa and opp direction

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7
Q

Name three factors that influence range Alfa particles travel in air

A

KE of the particles
Density of air
(Charge, but should be same)

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8
Q

What is Binding Energy?

A

BE is the energy required to SEPARATE A NUCLEUS INTO ITS PARTS
or the energy released when a nucleus is assembled from its constituent parts.

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9
Q

What are baryons?

A

Hadrons (particle made of quarks)
Particle consisting of 3 quarks.

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10
Q

What is the structure of a proton in terms of quarks?

A

uud

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11
Q

What is a neutron

A

udd

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12
Q

What are mesons?

A

Particle made of 2 quarks (one quark and an anti-quark, but not its own)

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13
Q

What is the charge of u c t quarks?

A

+2/3
Anti will be neg

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14
Q

Charge of d s b quarks

A

-1/3
Anti will be pos

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15
Q

Charge of leptons electron muon tauon and antilrptons

A

-1
Antiprotons = 0

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16
Q

Baryon number:

A

Quark = +1/3
So if have a baryon it is +1

17
Q

Strangeness

A

All quarks have zero EXCEPT the strange quark which has -1 strangeness

18
Q

Lepton number

A

All leptons have 1; anti leptons have -1

19
Q

MOT IN FB

A

Anti quarks have OPPOSOTE SIGN FOR BARYON NUMBER
Anti-strange quark has S=+1
Anti quarks have opposite charge etc

20
Q

What properties should be conserved?

A

Charge
Baryon number
Lepton number
Strangeness (not nec)