A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 mT directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 mV
b. 18 mV
c. 31 mV
d. 24 mV
e. 21 mV
B
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An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero
What is the magnitude of the orbital angular momentum L of the atom? A) 1.4? B) 2.0? C) 1.7? D) 1.0? E) 1.2?
In the text is a photograph that appears to show four identical galaxies arranged as a cross. What are we really seeing?
A) four galaxies that are nearly identical because they were born at about the same time B) four images of a single background galaxy, created by the gravitational lens of a massive foreground galaxy or cluster C) a large galaxy with four central masses that glow brightly D) a picture taken with a poorly made telescope, so that a single large object appears as four fuzzy dots
The type of detector that uses liquid hydrogen is a
A) Geiger tube. B) spark chamber. C) scintillation counter. D) cloud chamber. E) bubble chamber.
Of all the galaxies, _____ are easiest to notice
A) elliptical galaxies B) spiral galaxies C) lenticular galaxies D) dwarf spheroidal galaxies