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Why we use mercury light for experiment related to Photoelectric effect.?

April 26, 2017experiment light Mathematics mercury photoelectric Physics

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Why we use mercury light for experiment related to Photoelectric effect.?

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The spectral lines which mercury vapour lamps emit are well defined but also there are several lines spread out through the visible spectrum, allowing a great deal of flexibility with the experiments. Conversely, something like sodium only has a few, closely spaced lines.