JH- Exam 3 study. ch 14 Fluorescence

# JH- Exam 3 study. ch 14 Fluorescence - Electromagnetic...

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Electromagnetic Spectrum What is the frequency of light with a wavelength of a) 1 nm b) 500 nm c) 3 cm? a) 3 × 10 17 s -1 b) 6 × 10 14 s -1 c) 1 × 10 10 s -1 a) ν = c/λ ν = 3 × 10 8 m s -1 / 1 × 10 -9 m ----------------------------- Give the spectral classification of the radiation at each frequency: X-ray = 3 × 10 17 s -1 Visible = 6 × 10 14 s -1 Microwave = 1 × 10 10 s -1 ----------------------------- What is the frequency of orange light (620 nm)? c = 3 × 10 8 m/s ν = c/λ 4.84 × 10 14 s -1 ----------------------------- What is the energy of one photon of orange light (620 nm)? E = hv c = 3 × 10 8 m/s h = 6.626 x 10 -34 Js E = 6.626 × 10 -34 Js × 4.84 × 10 14 s -1 = 3.21 × 10 -19 J Optical Transitions Which of the following statements is not true? 1. The transition dipole moment connects the ground and excited state wave functions. 2. The dipole strength is the square of the transition dipole moment. 3. Wrong: The transition dipole moment is non-zero when the symmetry of the ground and excited state orbitals is the same. 4. The dipole moment operator has odd parity. 5. The dipole moment operator is used to calculate the rate at which molecules in the ground state are transformed to the excited state by the presence of light. ----------------------------- The Einstein coefficient B (the magnitude of the transition probability) determines the intensity of light absorption. Pick the best answer. 1. B is proportional to the dipole strength. 2. B is proportional to the transition dipole moment.

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