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]
The photocurrents produced by illuminating a meg nwim2i..tc9cy 997sxfnr*ytal pl7p:f2 jgqpej/gw m*3g ate with yellow light beamsgg*e: f/q g3wj2jppm7 of intensities $I_1$ and $I_2$ are $i_1$ and $i_2$ respectively. The corresponding stopping voltages are $V_1$ and $V_2$. Given that $I_1$<$I_2$ , which of the following statements is true about the photocurrents and the stopping voltages?
A. Photocurrents is $I_1$<$I_2$ ; Stopping voltages is $V_1$ = $V_2$
B. Photocurrents is $I_1$<$I_2$ ; Stopping voltages is $V_1$ < $V_2$
C. Photocurrents is $I_1$>$I_2$ ; Stopping voltages is $V_1$ = $V_2$
D. Photocurrents is $I_1$=$I_2$ ; Stopping voltages is $V_1$ < $V_2$
参考答案: A
本题详细解析:
Explanation: All photons carry the same energy (corresponding to the frequency of yellow light). That means the maximum kinetic energy is the same for electrons in both cases. Hence equal stopping voltages. Hence higher intensity implies larger number of photons per second, and thus larger number of electrons ejected, leading to a higher current. Thus $i_2$>$i_1$.
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