Cesium was discovered in natural mineral waters in 1860 by
Cesium was discovered in natural mineral waters in 1860 by R. W. Bunsen and G. R. Kirchhoff, using the spectroscope they invented in 1859. The name comes from the Latin word caesius, meaning “sky blue,” which describes the prominent blue line observed for this element at 455.5 nm. Calculate the frequency and energy of a photon of this light.
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