Quantum Mechanics

Question 1

Electron Gun

Answer 1

• Low voltage heats the cathode
• Thermionic emission
• Anode attract electrons
• Electrons pass through anode

Question 2

Energy in joules =

Answer 2

1.6x10^-19 x eV

Question 3

Dim UV light on metal plates

Answer 3

liberates a few electrons as there are LESS photons

Question 4

Bright UV light on metal playes

Answer 4

Liberates many electrons as there are MORE high energy photons

Question 5

red light

Answer 5

no electrons, becuase no matter the intensity, the photons do not have the work function to liberate electrons

Question 6

Work Function

Answer 6

The minimum amount of energy needed to liberate an electron

Question 7

Plank’s Equation

Answer 7

E=hf

Question 8

High freq photons

Answer 8

Higher energy photons

Question 9

High intensity photons

Answer 9

Higher number of photons

Question 10

Maximum kenetic energy =

Answer 10

hf- workfunction

Question 11

Threshold frequency

Answer 11

Cut of frequency for photoelectrons

Question 12

Continuous Spectrum

Answer 12

All wavelengths of light

Question 13

Line Spectrum

Answer 13

Few Wavelengths of light

Question 14

Monochromatic

Answer 14

One wavelength of light

Question 15

Spectra

Answer 15

Excited atoms that give of light

Question 16

Ionisation level

Answer 16

Ground state to highest possible level (energy of highest level-energy of ground state)

Question 17

Absorbtion Spectra

Answer 17

An atom absobs a photon with energy identical to lift an electron from a ground state to an excited state

Question 18

Sun’s Spectrum absoption lines

Answer 18

Due to coller gases in the outer layers of te sun