Snell's Law: Light enters air from water. The angle of refraction will be
A. greater than the angle of incidence.
B. equal to the angle of incidence.
C. less than the angle of incidence.
Answer: A
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Consider two concentric spherical shells, one with radius R and one with radius 2R. Both have the same uniformly distributed charge Q. Let E0 ? Q/(4??0R2). Which of the values below is closest to the magnitude of the electric field vector created by these shells at a point P just barely inside the outer shell?
A. zero
D. E0
E. 2E0
F. 4E0
T. Other
If an iron-0.77 % C steel is very slowly cooled from 800°C to room temperature, the expected microstructure is described as _____________.
Fill in the blank(s) with the appropriate word(s).
Astronomers know what the solar interior is like by
A. constructing a miniature Sun in the laboratory and extrapolating the results to the real Sun. B. using locally tested physics combined with observations to build a mathematical model of what the Sun should be like in its interior. C. observing the interior directly. By using the appropriate filters, it is possible to reduce the bright glow of the Sun and to peer directly at the Sun's interior. D. sending probes directly into the Sun and sending back the information.
Conversion of Units: If you are 5'10'' tall, what is your height in meters? (2.54 cm = 1.00 in.)
A. 1.5 m B. 1.6 m C. 1.7 m D. 1.8 m