When electrons are placed in a magnetic field, their spin orientations are quantized. How many orientations with respect to the field may result?
a. 1
c. 3
b. 2
d. 4 or more
B
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Refracting Telescope: A refracting telescope has a magnification M. If the focal length of the objective lens is doubled and the eyepiece focal length is halved, what is the new magnification?
A. 4M B. 2M C. M/2 D. M/4 E. M
The period-luminosity relation for Cepheid variables was discovered in 1908 by:
A) William Herschel. B) Henrietta Leavitt. C) Harlow Shapley. D) Heber Curtiss. E) Edwin Hubble.
After I dip a cup of water from the ocean, I can conclude that
A. the ocean temperature is higher because it never loses its heat. B. the ocean temperature is higher because it has more molecules in it. C. the temperature of the water in the cup is the same as the temperature of the water in the ocean. D. the temperatures are the same but the water in the cup has more energy.
A horizontal metal bar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of 5 × 10-5 T
If the magnetic field vector points straight down, what emf is induced between the two ends of the bar? A) 1.6 × 10-4 V B) 5.6 × 10-3 V C) 2.0 × 10-4 V D) 7.0 × 10-4 V E) 3.6 × 10-3 V