6
lesson pretestMultiple Choice

Pretest

Question 6 • Physics

Which best explains how the diffraction pattern observed in Young’s experiment supports the wave theory of light?

Answer
A
The pattern was caused by the reflection of waves.
B
The pattern was caused by light being separated into colors.
C
The pattern was caused by light moving in a straight path.
D
The pattern was caused by the interference of waves.

Explanation

In Young’s double-slit experiment, light passing through two slits produces overlapping waves. Where the waves reinforce each other, bright bands form; where they cancel, dark bands form. This alternating pattern is evidence of wave interference, so the best choice is “The pattern was caused by the interference of waves.”

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