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Since 1891 lighting lamps have been manufactured in the Netherlands. The improvement today in comparison to the first lamp is enormous , especially with the intorduction of the gas discharge lamps. The life- time has increased by orders of magnitude . the colour is also an important aspect. Rare earth metal compunds like CeBr_(3) are now included to reach a colour temperature of 6000K in the lamp the compounds are ionic solids at room temperature , and upon heating they sublime partially to give a vapour of neutral metal halide molecules . To achieve a high vapour pressure, the sublimation enthalpy should be as low as possible. Conclusion in relation to the previous answers. was adding CsBr a good idea ? Mark the correct answer. implies Adding CsBr is counterproductive. implies AddingCsBr has no influence implies Adding CsBr is advantageous implies From these data no clear answer can be given. |
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