Question

which statement describes an example of constructive interference? a. light forms bars on a surface after passing through two slits. b. oil spilled in a water puddle shows different colors of light. c. two tv signals reach an antenna and cancel each other out. d. a cell - phone signal is lost when you pass through a certain area.

Explanation:

Constructive interference occurs when two or more waves combine to form a wave with a larger amplitude. In the double - slit experiment (Option A), light waves passing through two slits interfere constructively and destructively to form bright and dark bars on a surface. Option B is an example of thin - film interference, Option C is destructive interference as the signals cancel each other, and Option D is likely due to signal blocking or absorption rather than constructive interference.

Answer:

A. Light forms bars on a surface after passing through two slits.