1. which wave refracts?
a an ocean wave hitting a break wall
b a wave going around an obstruction
c an ocean wave approaching the shore at an angle
d a wave that ripples in a fountain

C. an ocean wave approaching the shore at an angle

Explanation:

In wave physics we can say that one of the main phenomena involving two-dimensional waves is refraction. The refraction of a wave occurs on the liquid surface, when a wave passes from one medium of propagation to another, that is, it passes from a region of greater depth to another region of less depth, or the other way around. In this case, we can conclude that the option that best exemplifies a situation where the refraction of a wave occurs is "an ocean wave approaching the shore at an angle".

In refraction, the frequency of a wave is the frequency of the generating source, that is, it remains constant. The speed and the wavelength are directly proportional, this can be verified through the equation: v = λf. The deviation in the direction of propagation of a wave will only occur if it falls on the separation surface between the media with an inclination, that is, if it falls obliquely.

its probably to later but whats the question