It is the reflectivity of the surface. However, it is important to note that the reflected fraction depends on the wavelength of the incident light.
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There is no special name. The fraction of sunlight which is reflected will be different from the fraction of other light. The reflectivity of a surface varies with the wavelength of the incident light.
There is no particular term. This is because the reflectivity of a surface varies across the electromagnetic spectrum so a surface which reflects a large proportion of blue wavelengths in sunlight may or may not reflect a similar proportion of red wavelengths.
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A number can be called either a mixed number or a mixed fraction when it is a whole number with a fraction.
It is called a mixed number or a mixed fraction.