CHEM101 Lecture Notes - Lecture 2: Black-Body Radiation, Wavelength, Atomic Number
25 Jun 2018
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CHEM 101
Lec 2
Isotopes: atoms of an element with the same number of protons but a different number of
neutrons which causes different masses (same atomic number)
Ion: an atom that has a net charge, formed from the loss or gain of electrons
*know names of common monoatomic ions and their formula*
*do the naming compunds / writing forumlas on the powerpoint *
Visible light is a type of electromagnetic radiation
oWave properties are descrbied by three variables
Frequency (n) cycles per second
Wavelength (l) the distance a wave travels in one cycle (distance between
consecutive waves)
Amplitude: the height of a wave crest or depth of a trough
Higher frequency = shorter wave length
Wavelength and frequency has a reciprocal relationship
Different characterists of waves and particles as they move from one medium to the next (ex.
Waves refract as the go from air to water but particles will not refract)
oWaves defract but particles do not
Three observations involving matter and light wer eno explained by classical physics:
oBlackbody radiation
oThe photoelectric effect
oThe atomic spectra
Black body radiation:
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Document Summary
Isotopes: atoms of an element with the same number of protons but a different number of neutrons which causes different masses (same atomic number) Ion: an atom that has a net charge, formed from the loss or gain of electrons. *know names of common monoatomic ions and their formula* *do the naming compunds / writing forumlas on the powerpoint * Visible light is a type of electromagnetic radiation: wave properties are descrbied by three variables. Wavelength (l) the distance a wave travels in one cycle (distance between consecutive waves) Amplitude: the height of a wave crest or depth of a trough. Wavelength and frequency has a reciprocal relationship. Different characterists of waves and particles as they move from one medium to the next (ex. Waves refract as the go from air to water but particles will not refract: waves defract but particles do not.
