Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction?
a. 1.3
b. 2.4
c. 2.6
d. 1.8
e. 0.4
B
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When a glass rod is rubbed with silk, which of the following statements best describes what happens?
a. Electrons are removed from the rod. b. Protons are removed from the silk. c. The silk is charged positively. d. The silk remains neutral.
If the objective lens of a compound microscope is replaced with a lens of double the focal length while the eyepiece also has its focal length doubled, what will happen to the overall magnification of the microscope?
a. This will result in no change in the magnification. b. The magnification doubles. c. The magnification quadruples. d. The magnification decreases.
If the tension on a guitar string is increased by a factor of 2, the fundamental frequency at which it vibrates is changed by what factor?
a. 0.5 c. 2–1/2 b. 21/2 d. 2
How do astronomers detect the movement of galaxies?
A. the steady dimming of the galaxy's light B. the disappearance of the most distant galaxies as they move past the cosmic horizon C. the shift in spectral lines of the galaxies D. the rapid brightening of the galaxy's light