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.
20. In Study 2, y1 would most likely have been less than 10.0 mm if the students had used a laser emitting light having which of the following wavelengths ?
Your Answer is
Correct Answer is F
Explanation
It can be seen from table 2 that the smaller the wavelength, the smaller the y1;
So when y1 is less than 10 mm, the wavelength should also be less than 400 nm, and the 300 nm of the F option is in line