Make sketch that shows the emission spectra from a low-pressure mercury vapour lamp (Refer to Figure 5). Consult a suitable reference and annotate your sketch with the wavelength (in nanometres) of each spectral line. A Mercury atom emits a photon of light when one of its excited electrons 3) Makes a transition to a higher energy state. b) Makes a transition to a lower energy state. c) Escapes the pull of the atom's nucleus. d) Collides with a free electron. Discrete lines of colour in the emission spectrum of an atom suggests that; a) The energy states of electrons in the atom are discrete or quantised. b) The energy states of electrons in the atom are continuous. c) The energy states of protons in the nucleus are continuous. d) You haven't adjusted the spectrophotometer correctly to see the full spectrum of colours. A diffraction grating it made up of 3) Thousands of little lines spaced evenly apart. b) Thousands of little dots spaced evenly apart. c) A grid of thousands of horizontal and vertical lines. d) Two vertical slits only. Different coloured photons... a) Travel at different speeds through a vacuum. b) Have different wavelengths only. c) Have different frequencies only. d) Have different energies, frequencies, and wavelengths. Equation (1) indicates that a diffraction grating will diffract a) Emission lines of smaller wavelength to larger angles, b) Emission lines of larger wavelength to smaller angles, c) Emission lines of smaller wavelength to smaller angles, d) All emission lines to the same angle. 7. What angle, in degrees and minutes, is displayed by the Vernier scale in Figure 10? Figure 10 8. What angle, in degrees and minutes, is displayed by the Vernier scale in Figure 11? 9. What angle, in degrees and minutes, is displayed by the Vernier scale in Figure 12? Figure 1 2 In this week's experiment, you will look through your grating spectrometer at the light emitted by the mercury vapour lamp and see something like Figure 5. -|I-Hg Fig ure 5: Emission lines expected from l'o wpressure Mercury vapour lamps used in this experiment. Spectrum taken from [4}