3 Quantum Phenomena

Question 1

wave-particle duality

Answer 1

wave like = diffraction

particle like = photoelectric effect

Question 2

line spectra

absorption spectrum

Answer 2

black lines are correct wavelengths
electron excites
absorbed

Question 3

line spectra

emission spectrum

Answer 3

photon gives off a frequency as a colour

Question 4

Fluorescent lamp

Answer 4

ionisation and exciation of the mercury atoms occur as they collide with each other (electrons)

mercury atoms emit UV photons

photons absorbed by fluorescent coating causing exication of atoms

coating atoms dexcitation in steps and emit visible photons

Question 5

excitation

Answer 5

absorbs energy with becoming ionized

if the photon doesn’t have the full amount of energy then nothing would happen

extra energy turns to kinetic energy

Question 6

de-excitation

Answer 6

photons given out

Question 7

threshold frequency

Answer 7

minimum frequency of incident light which can cause the photoelectric effect

Question 8

photoelectric effect

Answer 8

1 electron absorbs 1 photon

UV light photon have enough to free an electron

Question 9

photoelectricity

electroscope

Answer 9

zinc and gold leaf

both negative

repel

Question 10

wavelength

Answer 10

least distance between two adjacent vibrating particles with the same displacement and velocity at the same time

Question 11

work function

Answer 11

minimum amount of energy needed by an electron to escape from a metal surface

Question 12

ionisation

Answer 12

process of creating ions

Question 13

ion

Answer 13

charged atom

Question 14

electron volt

Answer 14

amount of energy equal to 1.6*10-16 J defined as the work done when an electron is moved by 1V

Question 15

fluorescence

Answer 15

glow of light from a substance exposed to ultraviolet radiation, the atomised-excite in stages and emit visible photons in the process

Question 16

ground state

Answer 16

lowest energy state of an atom

Question 17

energy levels

Answer 17

the energy of an electron in an electron shell of an atom

Question 18

diffraction

Answer 18

spreading of waves on passing through a gap or near an edge

Question 19

de Broglie

Answer 19

matter particles have a wave-like nature characterised by the de Broglie wavelength

λ = h / mv

Question 20

cloud chamber

Answer 20

sealed environment of supersaturated vapour of water or alcohol
a charged particle interacts with the mixture- the fluid is ionised and becomes a mist

Question 21

particle accelerator explaination

Answer 21

uses electromagnetic field to propel charged particles to nearly light speed and to contain them in beams
radioscope / ion ion implanters

Question 22

particle accelerator stanford linear accelerate

Answer 22

california
3km
50000 million volts

Question 23

particle accelerator harden collider

Answer 23

geneva
accelerate charged particle to energies ,ore than 7000GeV
27km

Question 24

Stopping potential

Answer 24

Stopping potential is defined as the potential necessary to stop any electron

Would have to impose an electric field is that it will make it loss the extractly amount of kinetic energy

Question 25

Electron diffraction

Answer 25

Suggest that particles posses wavelike properties