Assuming the frequency remains constant, a monochromatic light ray is transmitted through an glass-to-air boundary, what happens to the wavelength?
a. decreases
c. increases
b. approaches zero value
d. remains unchanged
C
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Two identical conducting spheres A and B carry equal charge and exert electrostatic forces of magnitude F on each other. They are separated by a distance much larger than their diameters. A third identical conducting sphere C is uncharged. Sphere C is first touched to A, then to B, and finally removed. As a result, the electrostatic force between A and B becomes:
A) F/2 B) F/4 C) 3F/8 D) F/16 E) 0
In an electromagnetic wave, the electric and magnetic fields are oriented such that they are
A) parallel to one another and perpendicular to the direction of wave propagation. B) parallel to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) perpendicular to one another and parallel to the direction of wave propagation.
What material was used as fuel in the world's first nuclear reactor?
A) 14C B) 238U C) 235U D) 2H E) 239Pu
What is the mass of the supermassive black hole in the center of the Andromeda galaxy?
A. 10 times the mass of our Sun. B. 5000 billion times the mass of our Sun C. 400 billion times the mass of our Sun D. 30 million times the mass of our Sun E. 20 thousand times the mass of our Sun.