ws2f10key - CH301 Fall 2010 Worksheet 2 From EMR to QM to...

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Worksheet 2: From EMR to QM to EC and Beyond—Answer Key 1. Relate Electromagnetic radiation to physical phenomena Gamma rays, X-rays, UV, Visible, infrared, microwave, radio, television phenomenon Electromagnetic radiation Cooks food by heating water microwave Burns skin UV Used in night vision goggles IR Used in magnetic resonance imaging (MRI’s at hospitals) radio Makes pretty colored rainbows visible Splits atom nuclei gamma Makes molecules vibrate IR Makes molecules rotate microwave Make nuclei spin radio Let’s you watch your favorite TV show television 2. Rank the following five electron transitions in the hydrogen atom from highest energy to lowest energy (think of the Rydberg equation) 2 1 4 2 4 3 5 2 5 1 5 1 > 2 1 > 5 2 > 4 2 > 4 3 3. Rank the following five electron transitions in the hydrogen atom from longest to shortest wavelength (think of the Rydberg equation) 3 1 5 2 7 3 4 2 14 6 14 6 > 7 3 > 4 2 > 5 2 > 3 1 4. What is the de Broglie wavelength of a standard round fired from a Mauser C96? A standard round would have a mass of 5.6 g and an initial velocity of 430 m·s -1 . 5.6 g = 5.6x10 -3 kg λ = h/p = h/(mv) = 6.626x10 -34 J·s/(5.6x10 -3 kg*430 m·s -1 ) = 2.8x10 -34 m 5. Consider light with a wavelength of 470 nm. i. What color of visible light would this correspond to? Blue ii. What would the frequency of this light be? 470 nm = 4.70x10 -7 m ν = c/ λ = 3x10 8 m·s -1 /4.70x10 -7 m = 6.38x10 14 s -1 = 6.38x10 14 Hz iii. How much energy would a single photon of this light posses? Express your answer in joules. E = h
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This note was uploaded on 06/14/2011 for the course MATH 305G taught by Professor Cathy during the Spring '11 term at University of Texas.

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ws2f10key - CH301 Fall 2010 Worksheet 2 From EMR to QM to...

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