Question

when a person yells out over a canyon, they hear an echo of their voice.
when light travels from air to water, it bends slightly, causing the appearance of an underwater object to distort.
choose
choose
diffraction
interference
refraction
reflection

Explanation:

First Scenario (Yelling over a canyon, hearing an echo)

An echo is formed when sound waves hit a surface (like the canyon walls) and bounce back, which is the definition of reflection. Diffraction is the spreading of waves, interference is the superposition of waves, and refraction is the bending of waves when passing through different media (not bouncing back). So for the echo scenario, the correct concept is reflection.

When light moves from one medium (air) to another (water) and bends, this phenomenon is refraction. Diffraction is about spreading, interference is about wave superposition, and reflection is about bouncing back. So for the light bending scenario, the correct concept is refraction.

Answer:

Reflection

Second Scenario (Light traveling from air to water, bending and distorting underwater object appearance)