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The source of Einstein 's proposal that light was composed of particles -LRB- or could act as particles in some circumstances -RRB- was an experimental anomaly not explained by the wave theory : the photoelectric effect , in which light striking a metal surface ejected electrons from the surface , causing an electric current to flow across an applied voltage . | Wiki1k:wikipedia:9426:25:0 | 15 | act | true | act | [
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Experimental measurements demonstrated that the energy of individual ejected electrons was proportional to the frequency , rather than the intensity , of the light . | Wiki1k:wikipedia:9426:25:1 | 2 | demonstrated | true | demonstrate | [
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Arbitrary electromagnetic waves can be expressed by Fourier analysis in terms of sinusoidal monochromatic waves , which in turn can each be classified into these regions of the EMR spectrum . | Wiki1k:wikipedia:9426:42:1 | 5 | expressed | true | express | [
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Most UV and X-rays are blocked by absorption first from molecular nitrogen , and then -LRB- for wavelengths in the upper UV -RRB- from the electronic excitation of dioxygen and finally ozone at the mid-range of UV . | Wiki1k:wikipedia:9426:53:0 | 5 | blocked | true | block | [
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, which can be seen immediately from the Poynting vector . | Wiki1k:wikipedia:9426:74:0 | 4 | seen | true | see | [
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Classical Electrodynamics -LRB- 3rd ed . -RRB- . | Wiki1k:wikipedia:9426:82:1 | 4 | ed | true | nob | [
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The name `` euro '' was officially adopted in Madrid on 16 December 1995 . | Wiki1k:wikipedia:9472:16:0 | 7 | adopted | true | adopt | [
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Subsets and Splits