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Why is the Frank Hertz experiment different from the photoelectric effect?  For common Blackbody experiments, the Hg...

Why is the Frank Hertz experiment different from the photoelectric effect?  For common Blackbody experiments, the Hg lamp used is nearly white, made up of several intense spectral lines.  Why is the Franck?hertz emission primarily blue?  Does this correspond to the expected energy loss?

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