Electrons in Atoms Chapter 4.

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Presentation transcript:

Electrons in Atoms Chapter 4

Electromagnetic Spectrum All waves move at speed of light, c, 3.00x108 m/s Waves identified by: wavelength, , the distance b/ corresponding points on adjacent waves. Units: nm, cm, or m Frequency, , # of waves that pass a given point in a specific time, 1 sec. Unit: 1/s = Hertz, Hz

Frequency () Measured in cycles/second = hertz (Hz)

Wavelength and Frequency Inverse proportion equation!! Frequency, 1/s speed of light, m/s wavelength, m

A photon of red light has a wavelength of 665 nm A photon of red light has a wavelength of 665 nm. What is the frequency of this light? 665 nm = 665 x 10-9 m c =  •   = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m  = 4.511278 x 1014/s or Hz  = 4.51 x 1014/s or Hz

An x-ray has a frequency of 7.25 x 1020 Hz. What is the wavelength? 7.25 x 1020 Hz = 7.25 x 1020/s c =  •   = c ÷  = 3.00 x 108 m/s ÷ 7.25 x 1020/s  = 4.137931 x 10-13 m  = 4.14 x 10-13 m

Energy of Electromagnetic Radiation For all waves: E = h •  h = 6.63 x 10-34 J • s or J/Hz 8

A photon of red light has a wavelength of 665 nm A photon of red light has a wavelength of 665 nm. What is the energy of this light? 665 nm = 665 x 10-9 m c =  •   = c ÷  = 3.00 x 108 m/s ÷ 665 x 10-9 m  = 4.511278 x 1014/s or Hz  = 4.51 x 1014/s or Hz

Electromagnetic Spectrum What is the color of an electromagnetic radiation with an energy of 3.4 x10-19 J?