Engine_2014 : Electricity - 1540/2299
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| What is the main difference between a vacuum tube and a semiconductor device? |
| A) A vacuum tube requires a heated cathode to emit electrons, a semiconductor device does not. |
| B) A semiconductor device requires a heated cathode to emit electrons, a vacuum tube does not. |
| C) Both vacuum tubes and semiconductor devices require a heated cathode to emit electrons. |
| D) Neither vacuum tubes nor semiconductor devices require a heated cathode to emit electrons. |
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Illustration EL-0059
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