1. Spectroscopy
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6. (wavelength) x (frequency) = speed [m/s]
λν = c [3x108 m/s]

8. E = h ν

11. Visible light
from the sun
~ nm
Take 500 nm
electronic state

12. WHAT MAKES A MOLECULE ABSORB LIGHT?
When should you push?
AT THE RESONANT
FREQUENCY

13. AT THE RESONANT
FREQUENCY
λν=c

14. AT THE RESONANT
FREQUENCY
λν=c
VIBRATING
DIPOLES!

15. λ ν Electromagnetic spectrum
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17. E = h ν

18. The molecular structure of beta-carotene

20. E = h  = c/ E = hc/