Astronomers can use ________ to measure magnetic fields on the Sun
a. helioseismology
b. perchloroethylene (C2Cl4)
c. neutrino detectors
d. a magnetic carpet
e. the Zeeman effect
e
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Consider the situation below. Object A is a metal sphere with zero net charge, and objects B and C are particles with the same negative charge. Which choice shown to the right best indicates the direction of the electric field at point P? (If you are using the letters on the back cover to indicate your answer, you can indicate the double-letter choices by pointing to a letter with two fingers.)
A. A
B. B
C. C
D. D
E. Zero
F. AA
G. BB
H. CC
I. DD
Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. B) Its spectrum has the shape of an essentially perfect thermal radiation spectrum. C) With the exception of very small variations, it appears essentially the same in all directions in which we look into space. D) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old.
The bond between carbon atoms in the molecule acetylene, HC=CH is referred to as
A) an ionic bond B) a double bond C) a single bond D) a triple bond
A high-resistance material is used as an insulator between the conductors of a length of coaxial cable. The resistance material, which forms a hollow tube, has an inner radius a and an outer radius b, and the insulator provides a resistance R between the conductors. If a second insulator, made of the same material and having the same length, is made with double both the inner radius and the outer
radius of the first, what resistance would it provide between the conductors? a. R b. 2 R c. 4 R d. (ln2)R e. R/(ln2)