query: Do photons exist at all possible wavelengths?
positive_passages.docid: 144886
positive_passages.text: How many possible electromagnetic wavelengths are possible?
negative_passages.docid: 32307
negative_passages.text: How can we interpret polarization and frequency when we are dealing with one single photon?
negative_passages.docid: 136086
negative_passages.text: Can light be trapped theoretically?
negative_passages.docid: 123948
negative_passages.text: Why do I not see evidence of discrete energy in the spectrum?
negative_passages.docid: 38454
negative_passages.text: Do anti-photons exist?
negative_passages.docid: 142585
negative_passages.text: Is there a theoretical maximum for refractive index?
negative_passages.docid: 109743
negative_passages.text: Is a single photon always circularly polarized?
negative_passages.docid: 8946
negative_passages.text: Does the wavelength always decrease in a medium?
negative_passages.docid: 112965
negative_passages.text: Are virtual particles limited by the speed of light?
negative_passages.docid: 116871
negative_passages.text: Do photons take all paths or not?
negative_passages.docid: 141866
negative_passages.text: The lightest photon ever detected
negative_passages.docid: 148218
negative_passages.text: How precise must the energies match for absorption of photons?
negative_passages.docid: 60149
negative_passages.text: Can photons be detected without being absorbed?
negative_passages.docid: 81503
negative_passages.text: Do photons truly exist in a physical sense or are they just a useful concept like $i = \sqrt{-1}$?
negative_passages.docid: 41466
negative_passages.text: Can the photoelectric effect be explained without photons?
negative_passages.docid: 56610
negative_passages.text: Does a single white photon exist?
negative_passages.docid: 3909
negative_passages.text: Does $E = mc^2$ apply to photons?