Force on a Wire: When the switch is closed in the circuit shown in the figure, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is
A. a north magnetic pole.
B. a south magnetic pole.
C. There is not enough information given to answer the question.
Answer: B
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Most polymers that are solid at room temperature do not mix with other polymers even when melted, because of the very high ___________of mixing.
Fill in the blank(s) with the appropriate word(s).
The mass density of normal air is, at 293 K,
and the average molecular mass of air is 29.0 u. If the mean free path of an air molecule at room temperature is measured to be 111 nm, what is the average diameter of an air molecule.
A. 0.31nm B. 0.26nm C. 0.28nm D. 0.49nm E. 0.56nm F. 0.23nm
Violet light (? = 430 nm) is incident on a piece of potassium (? = 2.20 eV). What is the maximum kinetic energy of the ejected photoelectrons? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 2.43 eV b. 0.69 eV c. 2.89 eV d. 5.09 eV e. 0.96 eV
Which of the following optical elements used alone can produce a real image of an object?
A. Negative lens B. Plane mirror C. Convex mirror D. Concave mirror E. Prism