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Unformatted text preview: Atomic Structure and Periodicity Chemistry 7 th edition Chapter 7 Electromagnetic Radiation Do you listen to the radio, watch TV, or use a microwave oven? Electromagnetic Radiation Wavelength ( 29 Distance between two consecutive peaks or troughs in a wave Frequency ( ) Number of waves per second Speed All types of electromagnetic radiation travel at the speed of light Electromagnetic Radiation 1 / = c in meters in s1 Hertz (Hz) c = 3.00 x 10 8 m/s Example The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? Example The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? = c Example The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? = c = c Example The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? = c = 3.00 x 10 8 m/s 522 nm (1 x 109 m ) 1 nm Example The wavelength of the green light from a traffic signal is centered at 522 nm. What is the frequency of this radiation? = c = 3.00 x 10 8 m/s 522 nm (1 x 109 m ) 1 nm = 5.75 x 10 14 /s or 5.75 x 10 14 Hz History Max Planck Energy is gained or lost in whole number multiples E = nh n = 1, 2, 3, h = 6.626 x 1034 J s Plancks constant v = frequency History Albert Einstein E photon = h Photoelectric Effect Electrons emitted from matter E = h History Albert Einstein E = hv KE = 1/2m 2 = h h E = mc 2 History Albert Einstein E = h KE = 1/2m 2 = h h E = mc 2 m = E c 2 History Albert Einstein E = mc 2 m = E E photon = hc c 2 m = E = hc / = h c 2 c 2 c Wavelength Calculation Calculate the energy (in joules) of a photon of wavelength 5.00 x 10 4 nm. Wavelength Calculation Calculate the energy (in joules) of a photon of wavelength 5.00 x 10 4 nm....
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This note was uploaded on 11/22/2010 for the course CHM 121 taught by Professor Scheru during the Spring '09 term at Oakton.
 Spring '09
 SCHERU
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