Week #5 Assignment

1.      This property of electromagnetic radiation is inversely proportional to temperature.  If temperature increases
         _______ decreases.
         a. propagation speed       b. intensity       c. rate of emission       d. wavelength of peak emission

2.      The wavelength of peak emission from a tungsten lightbulb is about 1 micrometer.  Is the bulb  HOTTER  or  COLDER
         than the surface of the sun?  Is the peak emission from the bulb  VISIBLE  or  INVISIBLE  light?

3.      The wavelength of peak emission from the sun is determined largely by the sun's
         a. age       b. temperature       c. composition       d. size

4.      Which of the following are not found in the infrared portion of the spectrum? (more than one answer)
         a. 0.4 to 0.7 micrometer interval       b. the atmospheric window
         c. peak emission from the sun          d. peak emission from the earth

5.      Which of the following are true when the earth is in radiative equilibrium? (more than one answer)
         a. the earth absorbs 100% of the incoming sunlight
         b. the earth does not emit any electromagnetic radiation into space
         c. the temperature of the earth remains constant
         d. the earth gains and loses energy at equal rates

6.      A in the figure below represents incoming sunlight energy that is absorbed by the earth.  R is reflected sunlight energy
         and E is the radiation that is emitted by the earth.  Which of the following equations will apply when the earth is in
         radiative equilibrium?


7.      Fill in each blank below with  VIS(visible), IR(infrared), or UV(ultraviolet).

         strong absorption by O2 and O3 in the air_______                    peak emission from the sun is found in the_______

         selective absorption by CO2 and H2O__________                    the atmospheric window is in the_______

8.      ____________________ is the most abundant greenhouse gas in the earth's atmosphere.

9.      A window is a wavelength interval where the atmosphere   TRANSMITS   ABSORBS   REFLECTS   EMITS
         electromagnetic radiation.

10.     About 50% of the sunlight reaching the top of the atmosphere is
         a. absorbed by ozone       b. reflected by air molecules and clouds
         b. absorbed by the earth's surface       d. absorbed by greenhouse gases in the air

11.    Thick cloud cover will generally result in  HIGHER  LOWER  nighttime temperatures and  HIGHER  LOWER  daytime
         temperatures than would be observed on a day with clear skies.

12.    Which ray of light in the figure below will not have any effect on the surface temperature? (rays a and b are absorbed
         by the atmosphere and the ground, respectively; ray c is reflected by a cloud, and ray d is light emitted by the earth's
         surface)


13.    Which of the following best describes the effects of clouds on visible and infrared light?
         a. clouds are good absorbers of IR and visible light       b. clouds are good reflectors of visible and IR light
         c. cloud absorb IR light and reflect visible light             d. clouds reflect IR light and absorb visible light

14.    The figure below shows the earth's surface emitting 105 units of electromagnetic radiation; 99 units are absorbed
         by greenhouse gases in the atmosphere and 6 units pass through the atmosphere into space.  The atmosphere is
         emitting 38 units upward into space and 85 units downward toward the surface.  Clouds emit 26 units upward
         into space.  What must be added to the figure below to bring it into radiative equilbrium?