What phase of the Moon must it be to have a solar eclipse?
first quarter
full moon
third quarter
new moon
new moon
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What happens to the properties of elements across any period of the periodic table?
A) The elements tend to become more metallic in nature since they are increasing in atomic number. B) The elements get much larger in size because of the addition of more protons and electrons. C) The properties of the elements gradually change across any period of the periodic table. D) All of the above are true.
What collects the light in a reflecting telescope?
a. a mirror b. a lens c. your eye. d. a light bucket
A device that measures absolute air pressure is called a
a. manometer. b. barometer. c. thermometer. d. tire gauge. e. none of the above
Distinguish between the terms slit width and slit separation