1.1 electromagnetic radiation & atomic spectra

Question 1

wavelength

Answer 1

λ
measured in m or nm
distance between 2 adjacent points in a wave

Question 2

frequency

Answer 2

f
measured in Hz or s⁻¹
number of waves which pass a point per second

Question 3

velocity

Answer 3

c
3 x10⁸ ms⁻¹
distance traveled per unit of time

Question 4

wavenumber

Answer 4

v
measured in cm⁻¹ or m⁻¹
number of waves in 1cm or 1m of radiation

Question 5

convert m to nm

Answer 5

m x10⁹

Question 6

convert nm to m

Answer 6

nm x10⁻⁹

Question 7

convert cm⁻¹ to m⁻¹

Answer 7

x10²

Question 8

convert m⁻¹ to cm⁻¹

Answer 8

x10⁻²

Question 9

photons

Answer 9

particles of energy

Question 10

planck’s constant

Answer 10

6.63 x10⁻³⁴ J

Question 11

avogadro’s constant

Answer 11

6.02 x10²³ mol⁻¹

Question 12

how electrons become excited

Answer 12

photons are absorbed and promote electrons to higher energy levels
will fall to lower energy levels and emit photons of light energy

Question 13

emission spectroscopy

Answer 13

heat/electricity is used to excite electrons
photons are emitted as the electrons fall to lower energy levels

Question 14

producing emission spectra

Answer 14

measuring the intensity of light emitted at different wavelengths

Question 15

absorption spectroscopy

Answer 15

electromagnetic radiation is directed at an atomised sample
photons are absorbed and promote the electrons to higher energy levels

Question 16

producing absorption spectra

Answer 16

measuring how the intensity of light absorbed varies with wavelength