Question

1.

A) Calculate the wavelength of maximum energy emission and the total energy emitted each of the following objects: a) A tree, with a surface temperature of 18 oC and an emissivity 0.98 (2); b) A lake, with a surface temperature of 10 oC and an emissivity of 0.98(2).

B) Calculate the surface temperature of the following objects with a wavelength of maximum energy emission of: a) 10 micrometers(1); b) 500 nanometers (1).

C) Calculate the surface temperature of the following objects (assume both have an emissivity of 1.0): a) 200 W m-2 (1); b) 400 W m-2 (1).

D) If you have 1000 W m-2 of incident solar radiation perpendicular to a surface, calculate the solar radiation you would have at zenith angles of; a) 45o (1); b) 60o (1).

E) Most aquatic algae require a minimum of 25% of the solar radiation at the top of the water’s surface for photosynthesis. If the water’s extinction coefficient is 0.5 m-1, what is the maximum depth you could expect algal growth? (2)

F) Twelve percent of the solar radiation reaches the forest floor. The extinction coefficient is 0.4 m-1. What is the leaf area index of the forest? (2)

Answer 1