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Chapter 5 ATOMICTheory PPt - Chem I

# Chapter 5 ATOMICTheory PPt - Chem I - Chapter 5 Quantum...

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Chapter 5: Quantum Theory and Atomic Structure The Nature of Light Atomic Spectra The Wave - Particle Duality of Matter and Energy The Quantum - Mechanical Model of the Atom

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Electromagnetic Radiation WAVELENGTH - The distance between identical points on successive waves. ( λ ) FREQUENCY - The number of waves that pass through a particular point per second. ( ν ) AMPLITUDE - The vertical distance from the midline to a peak, or trough in the wave . c = λν

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Fig. 7.3

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Calculation of Frequency from Wavelength Problem: The wavelength of an x-ray is 1.00 x10 -9 m or 1 nm, what is the frequency of this x-ray? If the wavelength of long-wavelength electromagnetic radiation is 7.65 x 10 4 m, what is the frequency of this long-wavelength radiation used to contact submerged nuclear submarines at sea? Plan: Use the relationship between wavelength and frequency to obtain the answer. Solution: frequency(cycles/sec) = speed of light wavelength(m) frequency = = 3.00 x 10 17 cycles/sec 3.00 x 10 8 m/s 1.00 x 10 - 9 m a) b) frequency = = 3.92 x 10 3 cycles/s 3.00 x 10 8 m/s 7.65 x 10 4 m c = λν
Calculation of Energy from Frequency (a) What is the energy of a photon of electromagnetic radiation emitted by radio station KBSG 97.3 FM ( 97.3 x 10 8 cycles/sec)? (b) What is the energy of a gamma ray emitted by Cs 137 if it has a frequency of 1.60 x 10 20 /s?

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Chapter 5 ATOMICTheory PPt - Chem I - Chapter 5 Quantum...

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