query: Why is there an upper energy limit on the photoelectric effect?
positive_passages.docid: 129261
positive_passages.text: Photoelectric effect absorption coefficient decreases with energy, why?
negative_passages.docid: 77905
negative_passages.text: Why does an atom remain uncharged after emission of an alpha particle?
negative_passages.docid: 28165
negative_passages.text: Why can't a single photon produce an electron-positron pair?
negative_passages.docid: 148218
negative_passages.text: How precise must the energies match for absorption of photons?
negative_passages.docid: 51378
negative_passages.text: Photoelectric effect and work function
negative_passages.docid: 30883
negative_passages.text: Why can't energy be created or destroyed?
negative_passages.docid: 25262
negative_passages.text: Why can we apply the $E=hf$ equation for electrons?
negative_passages.docid: 81158
negative_passages.text: Light "diode" and 2nd law of thermodynamics
negative_passages.docid: 64508
negative_passages.text: Where exactly does energy quantisation come in for light?
negative_passages.docid: 46509
negative_passages.text: Energy level below ground state
negative_passages.docid: 69107
negative_passages.text: Is it possible to combine two photons of different energies to get a single photon of a higher (combined) energy?
negative_passages.docid: 62367
negative_passages.text: Why can two (or more) electric field lines never cross?
negative_passages.docid: 144664
negative_passages.text: Acceleration of electric charges and radiation
negative_passages.docid: 35411
negative_passages.text: If blackbody radiation at 6000K peaks in the optical, why aren't fluorescent bulbs at 6000K?
negative_passages.docid: 82418
negative_passages.text: Why not drop $\hbar\omega/2$ from the quantum harmonic oscillator energy?
negative_passages.docid: 117551
negative_passages.text: What limits the maximum sustainable surface charge density of a sphere in space?
negative_passages.docid: 6296
negative_passages.text: Why do electrons move towards anode in the Photoelectric effect experiment?