CHEM 1100 Lecture Notes - Lecture 5: Electromagnetic Radiation, Chlorofluorocarbon, Triple Bond
Document Summary
Speed of light= 3. 0 x 10^8 m/s. Measured in nm (one billionth of a meter) 1 m = 1 x 10^9 nm. Dliff wavelength (w) =diff kind of light. Ex: a radio station is 103. 5 fm. 103. 5 fm = 103. 5 mhz = 103. 5 million s-1 w= (3 x 10^8 m/s) / (103,500,000 s-1) = 2. 9 m (~10 ft) Ex: what is the frequency of light if w is 200 m? v = (3 x 10^8 m/s) / (200 m) = 1,500,000 s-1 = 1. 5 x 10^6 s-1. H = planck"s constant = 6. 63 x 10 ^-34 j-s. E = hv =(6. 63 x 10 ^-34 j-s) (1 x 10^15 s-1) = 6. 63 x 10^-19 j. Can calc wavelength also: e = hc/w. E = hc/w = [(6. 63 x 10 ^-34 j-s) (3 x 10^8 m/s)] / (3. 00 x 10^9 m) = 6. 63 x 10^-35. Visible= excite e-"s; chem rxns can occur (ex: photosynthesis) Uv= knock e-"s off ---> charged particles.
