The space between two parallel metal plates is filled with an element in a gaseous state. Electrons leave one plate at negligible speed and are accelerated toward the other by a potential di fference ΔV applied between the plates. As ΔV is increased from 0, the electron current increases more or less linearly, but when ΔV reaches 4.9 V, the current drops precipitously. From nearly 0, it builds again roughly linearly as A Vis increased beyond 4.9 V. (a) How can the presence of the gas explain these observations? (b) The gas emits a rather pure "light" when ΔV exceeds 4.9 V. What is its wavelength?
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