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प्रश्न
What was a naturally occurring crystal of galena with a metal point contact attached to it used for?
पर्याय
As a detector of radio waves
As a large evacuated space
As a heated cathode
As a Liquid Crystal Display monitor
MCQ
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उत्तर
A galena crystal with a metal point contact attached was used as a detector of radio waves. This use preceded a full formal understanding of the implications of semiconductor devices.
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