An E galaxy contains
a. mostly lower-main sequence stars and giants.
b. mostly upper main sequence stars and giants.
c. mostly upper main sequence stars and gas and dust.
d. roughly equal numbers of upper and lower main sequence stars.
e. mostly white dwarfs and supergiants.
A
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If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = ?80 nC, and q = 36 nC in the figure, what is the magnitude of the electric force on q?
a.
5.0 N
b.
4.4 N
c.
3.8 N
d.
5.7 N
e.
0.60 N
A gamma ray is another name for an electron
a. True b. False Indicate whether the statement is true or false
Current understanding holds that a galaxy's type (spiral, elliptical, or irregular) ________
A) may either be a result of the mass of the protogalactic cloud that formed it or the result of the heavy element abundance in that cloud B) is always determined by the angular momentum of the protogalactic cloud that formed it C) is determined by whether the galaxy is located in a cluster where collisions are likely or outside a cluster where collisions are less likely D) may either be the result of conditions in the protogalactic cloud that formed it or the result of later interactions with other galaxies
In the double-slit experiment with light, each photon impact occurs within an overall two-slit interference pattern. Thus, each photon "knows" that both slits (rather than only one) are open. This behavior is known as
A) quantum interference. B) quantum reality. C) quantum tunneling. D) quantum nonlocality. E) quantum randomness.