Given the following generic chemical reaction, which is the reactant?
X ? Y
A) Y is the reactant.
B) X is the reactant.
C) ? is the reactant.
D) Both X and Y are the products.
E) Both X and Y are the reactants.
Answer: B
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a. during a lunar eclipse. b. with a coronagraph. c. using filtergrams. d. during a lunar eclipse and with a coronagraph. e. none of the others.
A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
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