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प्रश्न
What did Lenard use to contain the emitter and collector plates?
विकल्प
A metal surface exposed to visible light
A gold-leaf electroscope
An evacuated glass tube
A clean zinc plate
MCQ
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उत्तर
Lenard used an evacuated glass tube containing two metal plates. One plate acted as the emitter, and the other acted as the collector.
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