Question

For radiation fog, one additional factor is required, this is ____.

a) High humidity
b) Wind
c) Clear sky
d) Low pressure

Answer 1

For radiation fog to form, the additional factor required is a clear sky. This condition allows heat to escape easily, cooling the air near the surface and leading to condensation and fog when the dew point is reached.

Step-by-step explanation:

For radiation fog, one additional factor is required, this is c) Clear sky. Radiation fog typically forms on clear nights with calm winds when the loss of heat by radiation cools the ground. When the ground cools, it causes the air close to the surface to cool as well, leading to condensation once the dew point is reached. A clear sky is essential as it allows the heat to escape, thus facilitating cooling of the air needed for fog formation. Other factors mentioned, including high humidity, can be conducive but are not the additional factor specifically required for radiation fog formation.