Because of their mass, the threshold temperature for electrons is:
A) higher than that of neutrons.
B) lower than that of protons.
C) higher than that of protons.
D) lower than that of hydrogen.
E) higher than that of hydrogen.
B
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Exclusion Principle: If ? = 4, which one of the following is a possible quantum number for n?
A. 0 B. 2 C. 3 D. 4 E. 8
The focal length of the lens of a simple camera is 40 mm. In what direction must the lens be moved to change the focus of the camera from a person 25 m away to a person 4.0 m away?
A) does not make any difference B) sideways from the film C) away from the film D) towards the film
______________ is the process whereby energetic molecules escape from a liquid
Fill in the blank(s) with correct word
When balancing a chemical equation, you must
a) be able to count individual atoms on each side of the reaction arrows. b) count only the polyatomic ions present in the reactants and the products. c) count only complete molecules and ignore any atoms that are in their elemental (uncombined) forms. d) make sure that there are always more atoms of reactant present than atoms of product, so that the reaction can proceed easily.