Passage IV
When waves of laser light pass through a narrow slit and onto a screen, they form a pattern of light and dark bands on the screen, as shown in Figure 1.
This phenomenon is called diffraction, and the pattern is called a diffraction pattern.
In each of the following studies of diffraction. students directed laser light through a slit, forming a diffraction pattern on a screen. They measured y1 the distance from the center of the brightest band in the pattern to the center of one of the 2 adjacent dark bands. In each study, x was the distance between the slit and the screen.
Study 1
In Trials 1-4, the slit width was varied, the wavelength of the laser light was fixed, and x was 6.00 m. The results are shown in Table 1.
Study 2
In Trials 5-8, the slit width was 0.24 mm, the wavelength (color)of the laser light was varied, and x was 6.00 m. The results are shown in Table 2.
Study 3
In Trials 9-12, the slit width was 0.24 mm, the wavelength was the same as in Study 1, and x was varied. The results are shown in Table 3.
25. For fixed values of wavelength and x, when the slit width was doubled, the distance from the center of the brightest band in the pattern to the center of one of the 2 adjacent dark bands:
Your Answer is
Correct Answer is B
Explanation
To discuss the relationship between x and y1, you should look at table 1;
In table 1, the slit width of Trail 2 is twice that of Trail 1, and the y1 of Trail 2 is only 1/2 of Trail 1 , so option B is reasonable