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प्रश्न
What prevents electrons from escaping a metal surface under ordinary conditions?
पर्याय
Free electrons pull the positive ions inward.
Light of suitable frequency holds them inside.
Attractive forces due to positive ions pull them inward.
A heated filament holds them inside.
MCQ
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उत्तर
At the surface, attractive forces due to positive ions pull electrons inward. This attraction prevents them from escaping under ordinary conditions.
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