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Nuclear & Quantum Physics E.2 Quantum Physics (id: 1787881c1)

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admin 发表于 2024-2-6 20:33:50 | 显示全部楼层 |阅读模式
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 illumidepr:nlgc 7uf 9ez51-nating .qw7xzqk4( n sa metal plate with yellow light beams nqqzk7 4(sw.xof 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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