CHEM1011 Quantisation of Energy THRESHOLD (Wk 1) Practice questions for chem1011 week 1 content.

What is the correct definition of "emission"? correct answer: The release of energy in the form of a photon as an electron transitions to a lower energy level What is the correct definition of an "excited state"? correct answer: All energy states other than ground state until ionisation threshold (E=0). How is the energy of a particle with restricted motion best described? (ie. an electron bound to an atom) correct answer: There are an infinite number of discrete energies possible for the particle. What is the correct definition of "energy level"? correct answer: One of the discrete energies a bound electron can have. What is the order the regions of the EM spectrum are ordered in? UV, violet, blue, green, yellow, orange, red, infrared correct answer: decreasing energy, increasing wavelength, decreasing frequency Calculate the wavelength, in nm, of a photon that has a frequency of 2.15 x 1015 Hz. Note: c = 3.00 × 108 m s-1. correct answer: 140 Calculate the frequency of a photon with energy of 6.96 × 10-17 J. correct answer: 1.05 × 105 THz What wavelength corresponds to the boundary between visible and IR radiation? correct answer: 780 Calculate the frequency of a photon that has a wavelength of 250 nm. Note: c = 3.00 × 108 m s-1. correct answer: 1.20e15 Hz