1 2 The Work Function Of Gold Is 7 8 X 10 19 Calculate Its Threshold Frequency The Maximum Wavelength Of Light That 1 (60.34 KiB) Viewed 40 times
1 2 The Work Function Of Gold Is 7 8 X 10 19 Calculate Its Threshold Frequency The Maximum Wavelength Of Light That 2 (94.03 KiB) Viewed 40 times
1. 2. The work function of gold is 7.8 x 10-19. Calculate its threshold frequency & the maximum wavelength of light that can be used to observe the photoelectric effect. The work function for platimum is 6.2 eV. If UV light of frequency 5.0 x 10¹5 S-¹ illuminates a platinum electrode, calculate the maximum kinetic energy of the photoejected electrons. 3. Calculate the wavelength of the line in the atomic spectrum of hydrogen in which & n, = 3. What is the energy change for this transition. nf 4. Calculate the wavenumber & wavelength of the first transition in the visible region of the atomic spectrum of hydrogen. 5. Show that the following four lines in the Lyman series can be predicted from the Balmer- Rydberg equation: 91.127, 97.202, 102.52, & 121.57 nm. 6. State which of the following n, ny transitions in the emission spectrum of atomic hydrogen belong to the Lyman, Paschen or Balmer series: a) 4-2 b) 3-2 c) 5-1 d) 4-3 e) 3 1 transition the
7. Calculate the energy (in kJmol-1 of photons) of a spectroscopic transition, the corresponding wavelength of which is 450 nm. 8. State the three sets of quantum numbers that define the three 3p atomic orbitals. Predict how many atomic orbitals make up the set with n = 4 & l = 3. 9. 10. Calculate the energies of atomic orbitals of hydrogen with n = 1, 2, 3, 4, & 5. State what can you say about the relative spacings of the energy levels. 11. State a set of quantum numbers that uniquely defines the five 4d orbitals. 12. Explain the physical significance of the quantum number my, by considering a 2p orbital with values of my = + 1,0, -1. 13. Classify the two possible sets of quantum numbers that describe an electron in a 2s atomic orbital. Explain the physical significance of these unique sets. 14. Calculate the energy of the 3s atomic orbital of a H atom. State whether the energy of the hydrogen 3p atomic orbital the same as or different from that of 3s orbital. Predict how many nodes & how many nodal planes a 4p orbital will have. 15. 16. Use sketches of 2s & 3p orbitals to distinguish between (a) the radial wavefunction & (b) the radial distribution function. 17 Interpret th
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