energy generated by quantum electronic transitions in an atom
DESCRIPTION
Energy generated by quantum electronic transitions in an atom. Units for Measuring Waves. Frequency = wavelengths/sec = Hertz. AM and FM Radio frequencies. 1 sec. 3 cycles per second = 3 hertz. In general means electromagnetic radiation The speed of light, c, is a constant: - PowerPoint PPT PresentationTRANSCRIPT
Energy generated by quantum electronic transitions in an atom
Units for Measuring Waves
1 sec
Frequency = wavelengths/sec = Hertz
3 cycles per second = 3 hertz
AM and FM Radio frequencies
• In general means electromagnetic radiation
• The speed of light, c, is a constant:– 2.99792458 x 108meters/second in a vacuum
• A measured number!! We will use 3.00x108 m/s
– 186,000 miles/second in a vacuum.– This is speed NOT frequency!
• The wavelength or frequency of light can be calculated from the formula:
c = wavelength (λ) * frequency (f)
c = λf
• Energy (E) of a single photon is the product of wavelength (f) and Planck’s constant (h).
E = hf
h = 6.63E-34 J-sec
• Now combine c = λf and E = hf
f = c/λ so E = hc/λ
• We now have three equations in terms of speed, wavelength, frequency and energy that characterize light
Electromagnetic Spectrum
Energy In Energy Out
Electron Transition Producing Light
Different Quantum Transitions Cause Different Wavelengths of Light
VISIBLE LIGHT380nm 750nm
Violet
Blue
Green
Orange
Red
Very Bright Light
Prism
Continuous white light spectrum
Bohr’s Model of the Atom
DeBroglie’s Model of the Atom
END FINI DONE
S - Orbital
P – Orbital P-OrbitalDiagram.exe
D - Orbital
F - Orbital