Answer
See answers.
Work Step by Step
A. Figure 24–5.
i. The light is traveling from left to right.
ii. The wave crests are spaced equally from left to right.
iii. The wave crests are not shown in Figure 24–5.
iv. One advantage of Figure 24–5 is to compare the particle theory prediction of 2 bright fringes to the actual result of seeing many fringes.
B. Figure 24–6.
i. The light is traveling from left to right.
ii. The 2D wave crests are in the plane of the page.
iii. The wave crests are shown in Figure 24–6 as vertical lines (before the light hits the slits) and by the blue curved lines (after the light passes through the slits).
iv. One advantage of Figure 24–6 is that it shows how the two slits act as new, in-phase point sources of waves. The figure also shows the interference of the 2 sets of wave crests when they reach the screen.
C. Figure 24–7.
i. The light is traveling from left to right.
ii. The 2D wave crests are in the plane of the page.
iii. The wave crests are shown in Figure 24–7abc as the peaks of the sinusoidal waves. Figure 24-7d doesn’t show the wave crests.
iv. One advantage of Figure 24–7 is that it shows how the two rays are in phase (constructive interference), or out of phase (destructive interference), when they reach the viewing screen.
