The second is currently defined as
A) 1/86,400 of a mean solar day.
B) 1/86,164 of a sidereal day.
C) 1/31,557,600 of the period of the Earth's rotation around the Sun.
D) the time required for light to travel 1/299,792,458 of a meter.
E) the time that it takes the radiation from a Cesium-133 atom to complete 9,192,631,770 cycles of oscillation.
Question 2
A plot of land contains 5.8 acres. How many square meters does it contain? 1 acre = 43,560 ft2
A) 2.3 104 m2
B) 7.1 103 m2
C) 7.0 104 m2
D) 5.0 104 m2
Measurements of solar cycle variation during the last 30 years
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Solar Harvesting Device
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What Happens to Incoming Solar Radiation?
Our planet absorbs solar radiation