(Ch 20 Vocab and Review) Name 2 wave interactions that can occur when a wave encounters a barrier. (Ch 20 Vocab and Review)

Reflection and diffraction

Explanation:

Reflection involves a change in direction of waves when they bounce off a barrier; refraction of waves involves a change in the direction of waves as they pass from one medium to another; and diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.Diffraction refers to various phenomena that occur when a wave encounters an obstacle or opening. It is defined as the bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture.

a.   mass number from atomic number