Tutorial 2 q - CHEM 1A03 TUTORIAL #2 September 21-25, 2009...

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CHEM 1A03 TUTORIAL #2 September 21-25, 2009 Solutions ________________________________________________________________________ Page 1 of 2 The following questions (1-14) are based on Chapter 8 + Lecture Notes. 1. The McMaster student FM radio station CFMU broadcasts at a frequency of 93.3 MHz (MHz = 1 megahertz = 10 6 sec 1 ). a) What is the wavelength of this signal in meters? b) What is the energy of one photon of this frequency? c) Compare the photon energy of part b with the energy of a photon of red light with wavelength 685 nm. 2. Sodium vapor lamps used for street lighting emit two yellow lines that are part of the atomic spectrum of sodium. One of the lines has a wavelength of 589.0 nm, and the other has a wavelength of 589.6 nm. a) Express each of these wavelengths in meters. b) What is the frequency of each of these lines? c) How much more energy, in joules, does a photon of 589.0 nm possess, as compared to a photon of 589.6 nm? 3. The longest-wavelength (i.e. lowest energy) light that causes an electron to be emitted from a gaseous lithium atom is 520. nm. Gaseous lithium atoms are irradiated with light of wavelength 400. nm. What is the kinetic energy of the emitted electrons, in kJ/mol?
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This note was uploaded on 01/16/2010 for the course CHEMISTRY 1A03 taught by Professor Dr.p.lock during the Fall '08 term at McMaster University.

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Tutorial 2 q - CHEM 1A03 TUTORIAL #2 September 21-25, 2009...

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