When solar radiation strikes the boundary between the air and top of the cover plate the percent of the incident intensity reflected is
A.0%
B.4%
C.8%
D.20%
A.the latitude angle
B.the hour angle
C.the solar altitude angle
D.none of the above
A.more than that for waves in red portion of the spectrum
B.less than that for waves in red portion of the spectrum
C.equal to that for waves in red portion of the spectrum
D.none of the above
A.Air
B.Fuel oil
C.Water
D.Ethylene glycol and water
A.freezing point
B.pour point
C.boiling point
D.none of the above
A.60 to 80 rpm
B.100 to 120 rpm
C.180 to 200 rpm
D.300 to 400 rpm
A.All longitudes and latitudes are great circles
B.All longitudes and equator are great circle
C.All longitudes and Greenwich meridian area great circle
D.None of these
A.pressure
B.temperature
C.volume
D.entropy
A.solar noon
B.sunset
C.sun rise
D.none of the above
A.convection
B.radiation
C.conduction
D.convection and radiation