Why is it important for a chemist to know the relative masses of atoms?
A) There are not that many different kinds of atoms and so it's important to know how they relate to one another.
B) It provides information about how many atoms two samples have relative to each other.
C) It provides an indication of how the different atoms will interact.
D) Because the mass of an atom is directly related to its chemical properties.
Answer: B
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When a dishonest scientist reports false information, he or she
A) as in many other professions, will be excused by the scientific community. B) gets no second chance in the scientific community. C) is elevated in the scientific community.
Is there any method by which we can detect individual atoms in the laboratory?
A) Yes, by using microscopes based on X-rays rather than on light. B) Yes, by using very high power microscopes based on visible light of very short wavelength. C) No, because atoms are purely mathematical abstractions and not real physical objects. D) Yes, by using microscopes based on the "matter waves" made by material particles such as electrons. E) No, because atoms are smaller than any physical wavelengths.
The electric fields arriving at a point P from three coherent sources are described by E1 = E0 sin ?t, E2 = E0 sin (?t + ?/4) and E3 = E0 sin (?t + ?/2). Assume the resultant field is represented by Ep = ER sin (?t + ?). The amplitude of the resultant wave at P is
a. E0. b. 1.5E0. c. 1.7E0. d. 2.4E0. e. 2.9E0.
What is the equivalent capacitance of the combination shown?
a.
20 ?F
b.
90 ?F
c.
22 ?F
d.
4.6 ?F
e.
67 ?F