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The photoelectric effect can be an important heating mechanism for the grains of dust found
in interstellar clouds. Ultraviolet photons (2~100 nm) strike small dust grains, eject electrons
and leave a positive charge behind. If the average energy of a ejected electron is 5 eV
(1 eV=1.602x10-19 J), estimate the work function of a typical dust grain.

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