The fraction of solar radiation reflected by a surface is called albedo.

Albedo is a dimensionless quantity that ranges from 0 (perfect absorption) to 1 (perfect reflection).

Here's a breakdown:

* High albedo: Surfaces like snow and ice reflect a large portion of sunlight, hence have a high albedo.

* Low albedo: Surfaces like asphalt and forests absorb more sunlight and have a low albedo.

Albedo is a crucial factor in determining the Earth's energy balance and climate.