Light strikes a diamond (n = 2.42) immersed in glycerin (n = 1.473) at an angle of 60° relative to the normal to the surface. What is the angle of refraction?
a. 20°
b. 60°
c. 32°
d. 64°
e. 15°
C
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Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of -1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
A. 42 N/C B. 84 N/C C. 34 N/C D. 68 N/C E. 0
What is the most accurate way to determine the distance to a very distant galaxy?
A) Stellar parallax B) main-sequence fitting C) white dwarf supernova D) Cepheid variables E) Hubble's law
The proper time interval between two events is measured from the frame of reference of an observer present at both events. Therefore, the proper time measurement of the decay of a neutron is measured by
A. an observer at the speed of light, relative to the neutron. B. an observer who is emitting light at all frequencies. C. an imaginary observer riding along with the neutron. D. an observer in the national lab at Los Alamos or any other certified nuclear lab.
Batholiths are massive plutons formed from the intrusion of
A) andesitic magma. B) granitic magma. C) basaltic magma. D) all of these