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what is wavelength
a consecutive trough and crest
what is frequency
the number of full wavelengths that pass a given point every second
equation for relationship between wavelength and frequency
c = lamda(f)
what is a blackbody
a perfect absorber and emitter of energy
what did planck discover about light from blackbodies
that energy is not continuously absorbed, it is transfered in packets or quanta
equation for energy of a photon
E = hf
what did scientists think increasing amplitude would do?(photoelectric effect)
increase kinetic energy of emitted electrons
what did scientists think increasing frequency would do to electrons?
increase current/ rate of electron emission
what ACTUALLY happened to electrons when increasing the frequency of light
the kinetic energy of electrons increased and current/rate of electron emission stayed the same
what ACTUALLY happened to electrons when increasing the light amplitude?
increased current and constant kinetic energy
what is the work function
the minimum amount of energy required to induce emission of electrons from a metal surface(depends on the metal)
main photoelectric effect equation
E(photon) = KE(electron) + work function
what is threshold frequency
the minimum frequency for electrons to be emitted regardless of light’s amplitude