How might dark matter particles be discovered?
A) by probing the interactions they have with the human body.
B) through looking with X-ray telescopes at the X-ray's they emit.
C) by measuring the radiation that comes from Type Ia supernovae.
D) through looking with infrared telescopes at the IR radiation they emit.
E) through experiments like the Large Hadron Collider.
Ans: E) through experiments like the Large Hadron Collider.
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Two planes of charge with no thickness, A and B, are parallel and vertical. The electric field in the region between the two planes has magnitude 
. The electric field in the region to the left of A and the electric field in the region to the right of B may have the magnitudes
a.
0, 0.
b.
.
c.
,
d.
given in any answer above.
e.
given only in answer (a) or (b) above.
The image of our galaxy in radio emission from CO, mapping the distribution of molecular clouds, is closest to the image of our galaxy in
A) 21-cm-line radio emission from atomic hydrogen. B) visible light, showing the edges of supernova bubbles. C) visible light, which is closest to how the night sky appears from Earth. D) X-rays from hot gas bubbles in the disk. E) infrared emission from interstellar dust grains.
Red and orange stars are found evenly spread throughout the galactic disk, but blue stars are typically found
A) in the halo. B) only in or near star-forming clouds. C) only in the central bulge. D) evenly spread throughout the galactic disk.
Two solenoids are each made of 2000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
A. 1/4. B. 1/2. C. 1. D. 2 E. 4.