第十章单元测试
- If a wave encounters a barrier that has an opening of dimensions similar to the wavelength, the part of the wave that passes through the opening will diffract into the region beyond the barrier. （ ）
- Near-field diffraction or Fresnel diffraction describes the situation in which both the point source and the screen are relatively close to the obstacle forming the diffraction pattern. （ ）
- Which of the following single slit diffraction experiments has the smallest size of the angle from the center of the diffraction pattern to the first dark fringe? （ ）
- In the single-slit diffraction pattern, as the wavelength of the incident light increases, the central maximum will （ ）.
- In a diffraction grating that has 400 slits per millimeter, the incident light is the sodium spectrum at a wavelength of 589nm, what is the maximum order that can be observed when the light is incident normally? （ ）
A:错 B:对
答案:对
A:对 B:错
A:wavelength 400 nm, slit width 0.30 mm; B:wavelength 600 nm, slit width 0.40 mm. C:wavelength 600 nm, slit width 0.20 mm; D:wavelength 400 nm, slit width 0.20 mm;
A:the width of the central maximum will not change B:the central maximum will become red C:the width of the central maximum will decrease D:the width of the central maximum will increase
A:1 B:2 C:3 D:4
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