Wave Behavior C.3 Refraction Diffraction Superposition Interference (id: 8a10191

本题目来源于试卷: Wave Behavior C.3 Refraction Diffraction Superposition Interference，类别为 IB物理学

[单选题]
In Young’s double-slit experiment, monochromatic light is incident on two slits and a diffraction pattern is observed on a distant screen. The graph shows the variation of intensity with distance from the centre of the pattern.


The slits are replaced by two slits with negligible width. What is the effect of this change on the interference pattern?

A. Central peak intensity increases and all maxima have the same intensity as the central peak
B. Central peak intensity increases and greater spacing of maxima
C. Central peak intensity decreases and all maxima have the same intensity as the central peak
D. Central peak intensity decreases and greater spacing of maxima


参考答案:  C


本题详细解析:
Explanation:

The interference pattern is not modulated by the single slit diffraction when slit width is negligible. Therefore, the intensities for all maxima should be the same. A decrease in slit width results in a decrease of maximum intensity. Therefore the peak values should be smaller.

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