A gravitational lens occurs when
A) a massive object causes more distant objects to appear much larger than they should, and we can observe the distant objects with better resolution.
B) a telescope lens is distorted by gravity.
C) a massive object bends light beams that are passing nearby.
D) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio.
C
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An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 10^4 V before it hits the target. What is the kinetic energy of the electron in electron volts?
1.1.00 × 10^4 eV 2.1.60 × 10^-15 eV 3.1.60 × 10^-22 eV 4.6.25 × 10^22 eV 5.1.60 × 10^-19 eV
Equation of Traveling Waves: Four waves are described by the following equations, where distances are measured in meters and times in seconds.I. y = 0.12 cos(3x - 21t)II. y = 0.15 sin(6x + 42t)III. y = 0.13 cos(6x + 21t)IV. y = -0.23 sin(3x - 42t)Which of these waves have the same speed?
A. I and II B. I and III C. II and III D. III and IV E. II and IV
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.
You are once again in a hot, dense place. You are surrounded by protons and neutrons, some rapidly fusing into helium. You notice that your surroundings are cooling (good, because it's really hot!) and rapidly dropping in density
Within about 3 minutes, the fusion reactions stop. Where are you? A) You are in the center of a star very much like our Sun. B) You are in the early universe during the era of nucleosynthesis. C) You are inside a nuclear power plant on Earth. D) You are in the center of a star much smaller than the Sun. E) You are in the center of a massive star near the end of its life.