CHE 131 Lecture 09-26-07

CHE 131 Lecture 09-26-07 - What is particle character?...

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What is particle character? Electromagnetic Radiation and Matter 7.1 EM Radiation Oscillating electric and magnetic fields Traveling wave All types (“colors”) have the same velocity (in vacuum), c = speed of light Speed of light is exact! *graph of magnetic vs. electric field in notes Light travels one foot per nanosecond Waves Wavelength – the distance between two crests length units m cm, nm Amplitude – center to top or center to bottom distance; Intensity of wave Frequency – speed of wave in time unit; number of crests passing a fixed point per unit time; inverse time units (s^-1); 1 hertz (Hz) = 1 s^-1 C = v λ 400nm-800nm > visible light *Energy of individual photon is directly proportional to frequency Ex. Some recently launched Earth-observing satellites operate at a frequency of 9.5 GHz. What is the wavelength of this radiation? λ = C v = 3.00 x 10^8 ms^-1 9.5 x 10^9 s^-1 = 0.032 m = 3.2 cm Radiation is microwave range
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Plank’s Quantum Theory 7.2 Heated solid objects emit visible light
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This note was uploaded on 05/03/2008 for the course CHE 131 taught by Professor Kerber during the Fall '08 term at SUNY Stony Brook.

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CHE 131 Lecture 09-26-07 - What is particle character?...

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