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Question
Selenium has the unusual property of being a good conductor in light but a poor conductor in the dark. It was, therefore, used in making.
Selenium has the unusual property of being a good conductor in light but a poor conductor in the dark. It was, therefore, used in making.
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Solution
The correct option is B Photo-electric cells
Since, selenium is a good conductor of electricity in light, but poor conductor in dark.∴ It is used in photo- electric cells.Since, photocell is an electronic device which works on the principle of photo electric effect and convert light energy into electrical energy.
Since, selenium is a good conductor of electricity in light, but poor conductor in dark.
∴ It is used in photo- electric cells.
Since, photocell is an electronic device which works on the principle of photo electric effect and convert light energy into electrical energy.
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