Question

diffraction occurs when waves _______ after passing through an opening.
a spread
b condense
sound waves going under a door is an example of sound wave _________.
a diffusion
b diffraction
bright spots are seen in the example of a two - slit pattern of light diffraction at the _______ of the two light waves that have been diffracted.
a gap
b overlap

Explanation:

• First question: Diffraction is the phenomenon where waves spread out after passing through an opening. Condensing (B) is the opposite of what happens in diffraction.
• Second question: When sound waves go under a door, they spread out (diffract). Diffusion (A) is a different process (e.g., mixing of substances in a fluid due to random molecular motion).
• Third question: In a two - slit light diffraction pattern, bright spots occur at the overlap of the two diffracted light waves. A gap (A) would not cause constructive interference (which leads to bright spots).

Answer:

1. A. spread
2. B. diffraction
3. B. overlap