Atomic nuclei consist of protons and electrons
Indicate whether the statement is true or false
FALSE
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This image shows the velocity of gas moving toward or away from us on the Sun's surface, as measured through Doppler shifts; the key indicates the measured velocity, with negative velocities indicating gas moving toward us and positive velocities away from us. Based on this map, about how fast is the sun rotating at its equator? (Hint: determine the speed at which equatorial gas is moving toward us on one side of the equator and away from us on the other.)
A) about 200 m/s B) about 2000 m/s C) about 20,000 m/s D) The Sun is not rotating.
Total Internal Reflection: A tank holds a layer of oil, of thickness To = 1.43 m, that floats on a layer of syrup of thickness Ts = 0.640 m, as shown in the figure. Both liquids are clear and do not mix together. A light ray, originating at the bottom of the tank at point P, crosses the oil-syrup interface at a point 0.900 m from the axis. The ray continues and arrives at the oil-air interface, 2.00 m to the right of P and at the critical angle. What is the index of refraction of the oil?
A. 1.64 B. 1.62 C. 1.60 D. 1.66 E. 1.68
The temperature increase in the stratosphere is
due to a) Rayleigh scattering. b) absorption of ultraviolet radiation. c) the greenhouse effect. d) photosynthesis.
If we could watch spiral arms from a telescope situated above the Milky Way over 500 million years, what would we see happen?
A) Stars will move through the spiral arms, bunching up closer as they pass through. Young hot stars will form and die within the arms before having a chance to move out. B) The spiral arms will seem to "wind up," wrapping more and more tightly around the center of the Galaxy. C) The spiral arms will quickly dissipate and fade away, because they are a temporary phenomenon that should only last for a million years or so. D) The spiral arms will eventually unwind, as centripetal forces send the stars flying outward into intergalactic space.