HW03 - Chemistry 111 Homework #3 Due: September 21, 2005...

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Chemistry 111 Homework #3 Due: September 21, 2005 (Wednesday) 1. Determine the frequency of an ultraviolet photon of light that has a wavelength of 35.4 Å. a) 3.00 × 10 8 s -1 . b) 1.18 × 10 –17 s -1 . c) 3.33 × 10 –9 s -1 . d) 8.47 × 10 16 s -1 . e) 2.82 × 10 8 s -1 . f) None of these. 2. Consider the following diagram: Calculate the energy for six photons of that particular electromagnetic wave. a) 1.21 × 10 -29 J b) 3.27 × 10 -21 J c) 1.18 × 10 -20 J d) 1.18 × 10 -25 J e) 5.45 × 10 -22 J f) None of these. 3. How many of the following statements concerning infrared radiation are TRUE ? 1. It is less energetic than ultraviolet radiation. 2. It is less energetic than visible radiation. 3. It has a lower frequency than radio waves. 4. It has a longer wavelength than X-Rays. 4. What is the wavelength of a given photon of light if you are told that a small stream of identical photons that contains a total of 25 photons has a total energy of 1.69 × 10 -18 J ? a) 118 nm b) 2.94 μ m c) 4.70 Å d) 470 nm e) 118 Å. f) None of these.
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Chemistry 111 2 Homework #3 / Fall 2005 5. The laser in an audio compact disc player uses light with a wavelength of 64.8 nm. What is the total energy of a beam of photons of this light if that beam contains one-third of a mole of these photons? a) 3.11 × 10 -18 J b) 6.16 kJ c) 1,870 kJ d) 3.11 J e) 616 kJ f) None of these. 6. How many of the following statements concerning electrons ejected from a metallic surface by the photoelectric effect is (are) true ? Type your numerical answer in Blackboard. 1. The number of electrons ejected decreases with increased light frequency at a given light intensity. 2. The kinetic energy of the electrons ejected increases with decreased light intensity at a given light frequency. 3.
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This note was uploaded on 02/08/2010 for the course CHEM 111 taught by Professor Kenney during the Spring '08 term at Case Western.

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HW03 - Chemistry 111 Homework #3 Due: September 21, 2005...

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