Comparing the following 4 models, which model predicts that galaxies had the largest separations in the past? (Use the graph of expansion models as a guide.)
A) accelerating B) coasting C) critical D) recollapsing
A
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Photoelectric Effect: Monochromatic light is incident on a metal surface, and the ejected electrons give rise to a current in the circuit shown in the figure. The maximum kinetic energy of the ejected electrons is determined by applying a reverse ('stopping') potential, sufficient to reduce the current in the ammeter to zero. If the intensity of the incident light is increased, how will the required stopping potential change?
A. It will remain unchanged. B. It will increase. C. It will decrease.
A coin is 12 cm in front of a convex lens with focal length of magnitude 4.0 cm. Where is the image?
A) 8.0 cm behind the lens B) 6.0 cm in front of the lens C) 6.0 cm behind the lens D) 4.0 cm in front of the lens
Charge of uniform density (20 nC/m2) is distributed over a cylindrical surface (radius = 1.0 cm), and a second coaxial surface (radius = 3.0 cm) carries a uniform charge density of ?12 nC/m2 . Determine the magnitude of the electric field at a point 2.0 cm from the symmetry axis of the two surfaces
a. 2.3 kN/C b. 1.1 kN/C c. 1.7 kN/C d. 3.4 kN/C e. 4.5 kN/C
Compared with equatorial open ocean waters, open ocean water in the northern Pacific
A) is colder and less dense. B) has a higher salinity content. C) is colder and more dense. D) has a lower salinity content.