Consider the following statements:
1- The albedo of an object determines its visual brightness when viewed with reflected light.
2- The albedo of Mercury is much greater than albedo of the Earth
Which of the statements given above is/are correct?
|A|| 1 only|
|B|| 2 only|
|C|| Both 1 and 2|
|D|| Neither 1 nor 2|
Ans. A The albedo of an object is the extent to which it diffusely reflects light from the sun. It is therefore a more specific form of the term reflectivity. Albedo is defined as the ratio of diffusely reflected to incident electromagnetic radiation. It is a unitless measure indicative of a surface’s or body’s diffuse reflectivity. The word is derived from Latin albedo “whiteness”, in turn from albus “white”. average albedo of the Earth is about 30%. Mercury is a dark world, the darkest major body in the solar system. It reflects a mere 11% of the sunlight that hits its surface.