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Chapter 5: Quantum Chemistry 27. A modern compact fluorescent lamp contains 1.4 mg of mercury. If each mercury atom in the lamp were to emit a single photon of wavelength 254 nm, how many joules of energy would be emitted? Hint: calculate moles of (massatomic mass) and then the number of atoms (6.023x 102 xmoles) 28. What type of spectrum, if any, would be produced if the light radiated by a heated atomic gas were to be dispersed through a prism? A) a continuous band of color B) a continuous band ofcolor with some dark lines (missing wavelengths) C) only blue light D) only red light E) discrete lines of different colors 29. Excited hydrogen atoms radiate energy in the A) infrared region only. B) visible region only. C) ultraviolet region only. D) visible and ultraviolet regions only. E) infrared, visible, and ultraviolet regions. Ans: E 30. For all the allowed vibration(s) (wavelength (s)) ofa plucked guitar string, what is the correct relationship between the length ofthe string, L, and the wavelength, A) L, N2 D) L na where n is a positive integer E) L 1/7. C) L nN2 where n is a positive integer Ans: C 31. The size of an atomic orbital is associated with A) the principal quantum number (n). B) the angular momentum quantum number (l. C) the magnetic quantum number (m). D) the spin quantum number (m,). E) the angular momentum and magnetic quantum numbers, together. Page 5
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