Solar radiation contains variety of wavelengths. Visible light has wavelengths between 0.4 and 0.7 micrometers. Shorter wavelengths are known as the ultraviolet (UV) part of the spectrum, while longer wavelengths are grouped into the infrared portion of the spectrum. Ozone is most effective in absorbing radiation around 0.25 micrometers, where UV-c rays lie in the spectrum. This increases the temperature of the nearby stratosphere. Snow reflects 88% of UV rays, while sand reflects 12%, and water reflects only 4% of incoming UV radiation. The more glancing the angle is between the atmosphere and the sun's rays, the more likely that energy will be reflected or absorbed by the atmosphere.Terrestrial radiation is emitted at much longer wavelengths than solar radiation. This is because Earth is much colder than the sun.   Radiation is emitted by Earth across a range of wavelengths, as formalized in Planck's law. The wavelength of maximum energy is around 10 micrometers.
A new planet has recently been discovered in another solar system. It is believed that this new planet has an atmosphere and landscape that is very similar to that on Earth. To verify this, the scientists are measuring the amount of UV rays that are reflected from the surface of the new planet in three regions: Region C is primarily snow; Region S is primarily sand; and Region W is primarily water.
If the atmospheres are the same, will Region W reflect more or less UV rays than Region C?