PHYA1 Jan 2010

What property defines Hadron

Particle experience Strong Nuclear Force

What quark structure of baryon

3 Quarks

Quark Structure Meson

Quark Antiquark

Antiproton Charge

-1.6×10 power minus 19

1di) state with reason what interaction is responsible for this decay

1dii) state 2 properties other than energy and momentum that is conserved in this decay

1di) Weak because strangeness is not conserved

1dii) charge lepton number and baryon number

Describe Process by which mercury atoms become excited in fluorescent tube

Electrons flow through tube

Collide with orbiting electrons

Raising electrons to higher level

What’s purpose of coating inside surface of glass in fluorescent tube

Photos emit from mercury atoms are in ULTRA VIOLET

photons are absorbed by powder

Powder emits photons in visible spectrum

Incident photons have a variety of different wavelengths

Draw arrow

3 to 2 one arrow

State and explain which conservation law may be used to shown its anti neutrino than neutrino

Lepton number Conserved

Lepton number before decay must be 0

So after decay lepton number of electrons cancels with lepton

0 both sides

What must be done to validate predictions of unconfirmed scientific theory

Hypothesis tested by experiment

Experiment must be repeatable

Why PhotoElectric Effect not observed below threshold frequency

Energy of photon depends on frequency

Below threshold frequency, photon doesnt have enough energy to overcome the work function of metal. So no electrons emitted

Each cell give same energy before going flat. The which 2 cells which will go flat first

C and D go flat first

Charge through C and D is double than A or B

Energy given to charge passing through cells per second