本题目来源于试卷: Nuclear & Quantum Physics E.2 Quantum Physics，类别为 IB物理学
[单选题]
No electrons are emitted when metal plate X is irradiat50fx0)a zw. *m yo9buv)hqq kyed by a hud,syw a/k7r-ca, lf67 q:oyn electromagnetic radiation of wavelengtafcyk6 ,aq/7wydol-u, s rh:7h λ, and intensity I. Which of the following could result in emission of photoelectrons?
I. Decreasing the wavelength λ of incident light.
II. Increasing the intensity of electromagnetic radiation at the same wavelength.
III. Replacing metal X, with a metal of smaller threshold frequency.
A. $I$ and $II$ only
B. $I$ and $III$ only
C. $II$ and $III$ only
D. $I$, $II$ and $III$
参考答案: B
本题详细解析:
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