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【单选题】
关于光电效应的规律，下列说法中正确的是( ) A.
发生光电效应时，不改变入射光的频率，增大入射光强度，则单位时间内从金属内逸出的光电子数目增多
B.
光电子的最大初动能跟入射光强度成正比
C.
发生光电效应的反应时间一般都大于 10 -7 S
D.
只有入射光的波长大于该金属的极限波长，光电效应才能产生
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A.
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A.
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B.
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C.
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D.
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