Line Spectra and the eV

Question 1

Electron Volt

Answer 1

Energy gained by an electron as it’s accelerated through a potential difference of 1V

Question 2

How do you go from eV to J?

Answer 2

Multiply by the charge on an electron

Question 3

How do you go from J to eV?

Answer 3

Divide by the charge on an electron

Question 4

Energy Level

Answer 4

Discrete energy of electrons

Question 5

What’s special about every element’s energy levels?

Answer 5

There are unique, characteristic energy levels for every element

Question 6

Explanation of emission spectra

Answer 6

Ground state, most stable
Incident photon absorbed, if electron has sufficient energy it excites and leaves ground state
Reaches a more unstable, higher energy level
Dexcites, emits a photon, quantum of energy
E=hf
f determines the nature of light ie colour

Question 7

Line Spectra

Answer 7

When elements are heated, they emit light with certain, distinct wavelengths which are detected as colours by the human eye