A quantum of electromagnetic radiation is a
a. wave function
b. photon
c. de Broglie wave
d. laser
e. hologram
B
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Elementary Particles: What are the possible charges of a quark (not an antiquark)?
A. -e, 0, e B. -2/3 e, -1/3 e, +1/3 e, +2/3 e C. -2/3 e, +1/3 e D. -1/3 e, +2/3 e E. -1/3 e, +1/3 e
Which of the following is TRUE?
A) The center of the universe is located at a point about 200 Mpc from us in the center of a cluster of galaxies. B) At the time that the Big Bang expansion began, all matter and energy in our observable universe was compressed into a single point of space. C) It is possible for galaxies that are very distant to actually move through space at a speed several times the speed of light. D) A redshift occurs when a photon loses energy and slows down as it moves through space. E) We measure a redshift for roughly half of the galaxies that we observe, and for the others we measure a blueshift.
Two unknown resistors A and B are connected together. When they are connected in series their combined resistance is 15 ?. When they are connected in parallel, their combined resistance is 3.3 ?. What are the resistances of A and B?
A) 15 ? and 5 ? B) 5 ? and 10 ? C) 2.5 ? and 5 ? D) 32? and 20 ? E) 10 ? and 30?
Moving electric charges make magnetic fields
a. True b. False Indicate whether the statement is true or false