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2. 若某金屬材料發生光電效應的底限頻率為v0,將此材料製成一半徑為R的圓球,以絕緣線懸掛於真空室內。若以頻率為v的單色光持續照射此金屬球,其中 v>v0。設卜朗克常數為h,基本電荷為e,庫侖常
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2. 若某金屬材料發生光電效應的底限頻率為v0,將此材料製成一半徑為R的圓球,以絕緣線懸掛於真空室內。若以頻率為v的單色光持續照射此金屬球,其中 v>v0。設卜朗克常數為h,基本電荷為e,庫侖常數為k ,則此球可帶的電量最多為 (3) 。
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