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. 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. 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.

When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases. Part of the wave travels faster for longer causing the wave to turn. The wave is slower but the wavelength is shorter meaning frequency remains the same.

Explanation:

b) phosphorus pentoxide

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.