The maximum efficiency of the best commercial (as opposed to research) solar cells is about
A) 1%
B) 10%
C) 20%
D) essentially 100%
Answer: C
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Astronomy
- Imagine that the Big Dipper crosses the meridian, the point straight overhead, at about 10:00 pm tonight. Where will the big dipper be in the sky at 1:00 am tonight?
- Imagine that the Big Sipper crosses the meridian, the point straight overhead, at about 10:00 pm tonight, Where will be Dipper be in the sky at 1:00 am tonight?
- If the light takes 8 minutes to reach Earth from the sun and 5 hours to reach Pluto, what is the distance from the sun to pluto?
- Why is the sky coordinate right ascension (RA) referenced to 1950.0 AD in most star atlases?
- The moon lies 384,000 km from Earth, and the Sun lies 150,000,000 km away. If both have the same angular size as seen from Earth, how many times larger (in diameter) than the Moon is the Sun?
- If Earth orbited the Sun in 9 months rather than 12, then, compared with a sidereal day, a solar day would be
- Pensacola, Florida lies at a latitude of 30 degrees north. If you're in Pensacola, where is Polaris in its sky?
- The last quarter phase of the Moon:
- Driving eastward just before sunrise, if you observe the Moon in the eastern sky, its phase must be:
- Why is there a two day difference the sidereal and synodic months?
- If the new moon fell on March 2nd, what is the moon's phase on March 14th?
- Which statement about the first quarter moon is FALSE?
- If the moon rose tonight at 6 pm, then tomorrow it will rise about:
- When the sun rises, it is located in the constellation Gemini. When the Sun sets later that same day, it will be:
- You note that a particular star is directly overhead, It will be directly overhead again in:
- Which statement about the ecliptic is false?
- From a location in the United States of America, a star is observed to be rising due East. Where will this star be located 6 hours later?
- The place the Sun stops its northward motion along the ecliptic is the:
- As it orbits the Earth, the Moon appears to move eastward about is own diameter every hour.
- Considering the Moon's phases, everyone on Earth sees
- How long does it take for the Moon to go around the ecliptic?
- The vernal equinox marks the beginning of
- What causes Earth's seasons?
- How long does it take the Sun to complete one circuit of the ecliptic?
- In a spectroscopic binary system, the star showing the larger blue shift is: