Final answer:
The frequency decreases and energy increases to make the sky appear red
Step-by-step explanation:
The correct statement that explains what happens to the frequency and energy of visible light waves for the sky to appear red is:
The frequency decreases, and energy increases.
When sunlight passes through the Earth's atmosphere, it interacts with the gases and particles present. The blue light waves have a higher frequency and shorter wavelength, and they scatter more easily, causing the sky to appear blue. However, during sunrise or sunset, the sunlight has to travel a longer distance through the Earth's atmosphere, which scatters out most of the blue light and allows more red light to reach our eyes. The red light waves have a lower frequency and longer wavelength, and they are less scattered, resulting in the sky appearing red.
Learn more about The interaction of light waves with the Earth's atmosphere