Particles and Waves

Question 1

Forces on charged Particles

Answer 1

Ew=QV

Ek=1/2mv²

Question 2

Alpha decay

Answer 2

emits product and He₂⁴

Question 3

Beta decay

Answer 3

emits product and e ₋₁ ⁰

Question 4

Gamma emission

Answer 4

product stays the same

Question 5

mass lost or energy released by nuclear reaction

Answer 5

e=mc²

Question 6

Irradiance

Answer 6

Power per unit of area incident on a surface

I=P/A

Question 7

Point Source of light

Answer 7

I=k/d² or I₁d₁²=I₂d₂²

Question 8

h=

Answer 8

Planck’s constant

Question 9

photoelectric effect

Answer 9

E=hf

Ek= hf - hf₀

Ek=1/2mv²

v=fλ

Question 10

frequency of radiation emitted or absorbed

Answer 10

E=hf

E₂-E₁=hf

Question 11

Angle of incidence or angle of refraction

Answer 11

n= sinθ₁/sinθ₂

Question 12

Critical angle or refractive index

Answer 12

Sinθ꜀=1/n

Question 13

n=

Answer 13

refractive index

Question 14

diffraction grating

Answer 14

dSinθ=mλ

Question 15

d=

Answer 15

distance between

Question 16

m=

Answer 16

order maxima number

Question 17

sinθ₁=

Answer 17

angle of incidence

Question 18

What exist between charged parallel plates

Answer 18

electric fields

Question 19

Do electric fields exist between or around charged particles

Answer 19

around

Question 20

+ L or R?

Answer 20

Left

Question 21

• L or R?

Answer 21

Right

Question 22

thumb
1st
2nd

Answer 22

T- Direction of motion
1st- Field (into or out of page)
2nd- Current

Question 23

Define Potential Difference

Answer 23

work done per unit charge

V=W/Q

Question 24

Moving charge produces

Answer 24

a magnetic field

Question 25

how do fusion reactors contain high temperature charge particles (plasma)

Answer 25

using a ring of magnetic fields

Question 26

What is the photoelectric effect evidence for

Answer 26

the particle model of light

Question 27

The particle model of light suggests?

Answer 27

Light is made up of a constant stream of photons

Question 28

What is photoemission

Answer 28

photons, provided they are over the threshold frequency and work function, can eject photons from the surface of materials

Question 29

Define Threshold frequency

Answer 29

minimum frequency of a photon required for photoemission.

Question 30

Define Work function

Answer 30

minimum energy of a photon required for photoemission.

Question 31

What is evidence for the wave model of light?

Answer 31

Interference

Question 32

Coherent Waves

Answer 32

Constant phase relationship

Question 33

Constructive interference

Answer 33

when coherent waves meet in
phase, peaks of waves meet peaks
and troughs meet troughs.

Question 34

Destructive interference

Answer 34

when coherent waves meet out of phase, peaks meet troughs.

Question 35

Produced when path difference is a whole number

Answer 35

maxima

Question 36

Bohr model

Answer 36

Electrons occupy discrete orbits. (have energy levels)

Question 37

innermost energy level

Answer 37

Ground state n=1

Question 38

Ionisation

Answer 38

When an electron has sufficient energy to escape an atom

Question 39

as electrons grow further from the nucleus

Answer 39

Potential energy increases

Question 40

Absolute refractive index

Answer 40

the ratio of the speed of light in a

vacuum to the speed of light in the medium.

Question 41

Angle of incidence

Answer 41

Going into (from normal to line)

Question 42

Angle of Refraction

Answer 42

After it has entered (from normal to line)

Question 43

refractive index increases

Answer 43

f of incident radiation increases

Question 44

Aoi that produces and Aor of 90◦

Answer 44

Critical angle

Question 45

Frequency or energy gained or lost by an electron/photon

Answer 45

E=hf

Question 46

hf₀=

Answer 46

work function

Question 47

Energy of a photoelectron emitted from material

Answer 47

Ek= hf - hf₀

Ek=1/2mv²

Question 48

What is path difference?

Answer 48

distance between two order maximas’