ELECTROMAGNETIC SPECTRUM refer to your handouts and pages 731 to 737 label the following: 1)7 types of electromagnetic waves 2)largest and smallest frequency.

ELECTROMAGNETIC SPECTRUMrefer to your handouts and pages 731 to 737

label the following:1)7 types of electromagnetic waves2)largest and smallest frequency 3)largest and smallest wavelength 4)largest and smallest energy5)largest and smallest temperature 6)1-2 major characteristics of each wave7)examples/uses of each wave

answer the following questions:1)what is an electromagnetic wave?2)summarize bottom of page 7343)does an EM wave require a medium?4)what is the SI unit for frequency?5)what is the SI unit for wavelength?6)what is the SI unit for energy?7)what is the SI unit for temperature?8)what equation relates wavelength to frequency?

radio (smallest frequency, largest wavelength, smallest energy level, smallest temperature)travel easily around objects to transmit information across long distancesradios and televisionsmicrowaveemitted by all matter at typical temperatures, penetrate through non-dense objectsheat food, Doppler radar for weather, study stars, satellite communication infraredheat given off by anything warm (sun, fire, human bodies)remote controls, burglar alarms, night-vision gogglesvisibleemitted by the sun and other hot objects, only waves visible to humanslight bulbsultravioletemitted by the sun and other hot objects, causes sunburndisinfectant to kill bacteria in city water supplies or to sterilize equipment in hospitalsx-raysemitted by very high energy sources (supernovas and radioactive material), can travel through solid objectsx-ray machinesgamma (largest frequency, smallest wavelength, largest energy level, largest temperature)emitted by extremely high energy sources (nuclear explosions and destruction of atoms), harmful to humanskill cancerous cells

what is an electromagnetic wave? a wave of perpendicularly oscillating electric and magnetic fields which radiate outward from the source at the speed of lightwhat is a photon? a quantum of light, has energy but not massdoes an EM wave require a medium? nowhat is the SI unit for frequency? hertz (Hz)what is the SI unit for wavelength? meter (m)what is the SI unit for energy? electron volt (eV)what is the SI unit for temperature? kelvin (K)what equation relates wavelength to frequency? λ = c/fλ = wavelengthc = the speed of light = 3.00 x 108 m/sf = frequency

PROBLEM SETdue Monday the 26th

25 pts (completion)

Quantum EnergyPage 755 Practice A #1-4The Photoelectric Effect

Page 758 Practice B #1&4Energy-Level Diagrams

Page 769 Practice C #2&3DeBroglie Waves

Page 774 Practice D #1,4,5

BLACKBODY RADIATIONrefer to your handouts and pages 752 to 755

blackbody – a perfect radiator and absorber and emits radiation based only on its temperature

PHOTOELECTRIC EFFECTrefer to your handouts and pages 756 to 760

photoelectric effect – the emission of electrons from a material surface that occurs when light of certain frequencies shines on the surface of the material

MODELS OF THE ATOMrefer to your handouts and pages 762 to 763

Create a timeline of three models of the atom.Include the following:

name of scientist short description of model

picture of model

ATOMIC SPECTRArefer to your handouts and pages 763 to 765

atomic spectra – an empty glass tube is filled with a pure atomic gas, then a high potential difference is applied between metal electrodes to produce a current in the gas, then the tube gives off light that is characteristic of the gas

uses: emission lines can identify elements in a mixture and absorption lines can identify elements in the solar system

BOHR MODEL OF HYDROGEN ATOMrefer to your handouts and pages 765 to 770

problems with this model:

~ only valid for atoms containing one electron~ violated the laws of classical physics because electrons in acircular orbit would accelerate to the center, not maintain a fixed circular orbit~ violated Heisenberg’s uncertainty principal becauseelectrons were considered to have both a known radius(position) and orbit (momentum)~ no explanation for the assumption that electrons do notradiate energy when in a stable orbit~ no explanation for why electrons have certain stable orbits

DUAL NATURE OF LIGHTrefer to your handouts and pages 771 to 772

MATTER WAVESrefer to your handouts and pages 772 to 774

matter waves – also called deBroglie waves; reflects the wave-particle duality of matter; wavelength is indirectly proportional to momentum (λ = h/p) and frequency is directly proportional to energy (f = E/h)

UNCERTAINTY PRINCIPLErefer to your handouts and pages 775 to 776

uncertainty principle – it is impossible to simultaneously determine a particle’s position and momentum with infinite accuracy

ELECTRON CLOUDrefer to your handouts and pages 776 to 777

electron cloud – the region of negative charge surrounding an atomic nucleus that is associated with an orbital; idea was first proposed by Schrodinger

Timeline of Quantum Physics