### Instruction:

Extract the cause and effect entities from the following sentence:
For a given spectral interval, albedo is the ratio between the power per unit surface area emitted by a surface and the power per unit surface area incident on the surface

### Assistant:

KEYWORD: For
VARIABLE: albedo
CONDITION: is the ratio between the power per unit surface area emitted by a surface and the power per unit surface area incident on the surface
CAUSE_1: a given spectral interval
EFFECT_1: albedo is the ratio between the power per unit surface area emitted by a surface and the power per unit surface area incident on the surface

