Atomic, molecular, and optical physics the origin of the index of refraction treated an electron in an atomic system classically according to the model of Paul Drude and Hendrik Lorentz. The theory was developed to attempt to provide an origin for the wavelength-dependent refractive index "n" of a material. In this model, incident electromagnetic waves forced an electron bound to an atom to oscillate. The amplitude of the oscillation would then have a relationship to the frequency of the incident electromagnetic wave and the resonant frequencies of the oscillator. The superposition of these emitted waves from many oscillators would then lead to a wave which
Some Girls Are Bigger Than Others track in then out again, and took the reverb back off when reintroducing the song: "A bit like opening a door, closing it, then opening it again and walking in". The lyric paraphrases Johnny Tillotson's 1962 single "Send Me the Pillow That You Dream On", and broadly references the 1964 comedy "Carry On Cleo" ("Oooh, I say"). In the mainstream British music press, "Some Girls Are Bigger Than Others" was mentioned in the context of "The Queen Is Dead". In the "NME", Adrian Thrills wrote, "As an album with humour never far from its surface, it is fitting that "The