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

admin · 发表于 2024-2-6 20:33:50

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 metal7xw u-l6xfne lm9 g8t6 plate with yelbp6cl,4fe.qskck ry(e6)dq3n6 c;y klow light beams of intp r eec. 6kc)ldf,yb k(63qnqkcy;s46ensities

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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