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In a vacuum tube filled with mercury vapor?
In a vacuum tube filled with mercury vapor, as shown in the figure, http://session.masteringphysics.com/problemAsset/1003669/17/172819.jpg electrons are emitted from a heated cathode through thermionic emission. The electrons are then accelerated toward a positively charged grid; immediately behind the grid is a collecting plate.Suppose that the collector is held at a small negative voltage with respect to the grid. Will the accelerated electrons reach the collecting plate?
A.Yes, but only those electrons with energy less than the potential difference established between the grid and the collector will reach the collector.
B.Yes, but only those electrons with energy greater than the potential difference established between the grid and the collector will reach the collector.
C.Yes; all the accelerated electrons will reach the collector.
D.No, none of the electrons will reach the collector.
B. Yes, but only those electrons with energy greater than the potential difference established between the grid and the collector will reach the collector.
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