Question

1. which occurs when a wave is reflected? (1 point)

the wave can flip upside down.
the waves frequency increases.
the wave can speed up.
the waves amplitude increases.

Explanation:

When a wave reflects from a fixed - end boundary, it can flip upside down (undergo a phase change of 180 degrees). The frequency, speed, and amplitude of a wave do not change simply due to reflection in an ideal situation. Frequency is determined by the source, speed depends on the medium, and amplitude can change due to energy losses in non - ideal conditions but not as a direct result of reflection.

Answer:

The wave can flip upside down.