When a wave is refracted, Group of answer choices

it enters a new medium or material and the wave bends and changes speed. An example is how a straw looks bent in a glass of water.

it bounces off a surface, like when you see yourself in the mirror.

it has encountered a barrier and is bent around it. An example is when you can hear someone through an open doorway but you cannot see them.

its waves have gotten bunched up and the frequency is higher, like when an ambulance is coming towards you with its sirens on, it has a higher pitch.

dis Question tripin

Explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation: