Particles and Waves

Question 1

Electric field

Answer 1

The force charged particles experience

Question 2

The arrows show the

Answer 2

Direction of force on a positive charge

Question 3

Closer lines show a

Answer 3

Stronger electric field (bigger force)

Question 4

Further away lines show a

Answer 4

Weaker electric field (smaller force)

Question 5

Electric fields cause charged particles to

Answer 5

Accelerate

Question 6

The potential difference (voltage) between 2 points is the

Answer 6

Work done when one coulomb of charge moves from one point to the other

Question 7

Current in a wire creates a

Answer 7

Magnetic field

Question 8

Left hand grip rule (for negative charges and electrons)

Answer 8

Thumb -direction of current
Finger -shows magnetic field
For positive points the other way

Question 9

A wire carrying current experiences a force if

Answer 9

The current cuts across a magnetic field

Question 10

Right hand rule

Answer 10

First finger -field (north>south)
Second finger -current
Third finger -path of electron

Question 11

LINAC works by

Answer 11

Charge particle gains energy every time it passes from one drift tube to the next
The frequency of the AC. is just right to march the progress of the charged particles through the drift tubes

Question 12

How does a cyclotron work

Answer 12

Two hollow metal Dees
Particle gains energy every time it moves from one Dee to the next
Magnetic field causes particle to follow curved path
Frequency of A.C matches the progress of particle

Question 13

Antimatter

Answer 13

Every particle has a corresponding particle of antimatter

Question 14

If a matter particle meets its antiparticle they

Answer 14

Destroy each other and release 2 protons

Question 15

Fermions

Answer 15

Leptons +Quarks

Question 16

Hadrons

Answer 16

Baryons + mesons

Question 17

Bosons

Answer 17

Gluon
Photon
Zboson
Wboson

Question 18

Types of Leptons

Answer 18

Electron
Muon
Tau
Electron neutrino
Muon neutrino
Tau neutrino

Question 19

Types of Quarks

Answer 19

Up
Down
Charm
Strange
Top
Bottom

Question 20

Baryons are made from

Answer 20

3 quarks

Question 21

Mesons are made from

Answer 21

A quark and antiquark pair

Question 22

Mesons have

Answer 22

Short lifetimes

Question 23

Mesons are

Answer 23

Very unstable

Question 24

Types of bosons

Answer 24

Gluon
Photon
Zboson
Wboson

Question 25

Alpha decay

Answer 25

Addition of a helium nucleus

Question 26

Beta decay

Answer 26

Loss of an electron

Question 27

Gamma decay

Answer 27

Internal rearrangement if the nucleus

Question 28

Fission reaction

Answer 28

Large nucleus splits forming smaller nuclei

Question 29

Fusion

Answer 29

Joining together of small nuclei to form larger nucleus

Question 30

Irradiance is the

Answer 30

Power (energy per second) incident on one unit of area on a surface

Question 31

Photon

Answer 31

Particle of light

Question 32

Threshold frequency

Answer 32

Minimum frequency for photo emission to occur

Question 33

Photoemission

Answer 33

When an incident photon ejects an electron onto a metal plate.

Question 34

Interference is

Answer 34

Evidence if wave behaviour

Question 35

If waves have a constant phase relationship then they are

Answer 35

Coherent

Question 36

Constructive interference

Answer 36

When waves arrive in phase and displacements add together

Question 37

Destructive interference

Answer 37

When waves arrive out of phase and displacements cancel out

Question 38

If oath diference is the same as a whole number of wavelengths (m)

Answer 38

Constructive interference happens and a maximum is created

Question 39

If path difference results in a phase difference of 0.5, 1.5, 2.5 etc wavelengths then

Answer 39

Destructive interference happens and a minimum is created

Question 40

What type of spectra do hot sources of light produce

Answer 40

Continuous spectra

Question 41

What type of spectra do neon lights produce

Answer 41

Line omission spectra

Question 42

The refractive index varies with the

Answer 42

Index of light

Question 43

Regular refraction

Answer 43

Angle of refraction bigger than the critical angle

Question 44

Total internal reflection

Answer 44

Angles are equal

Question 45

When the angle of incidence is the critical angle

Answer 45

The angle of refraction is 90 degrees