In a hydrogen atom, a transition from the third to the second energy level will produce:
A) a red emission line.
B) a blue green absorption line.
C) a violet emission line.
D) an infrared emission line.
E) an ultraviolet absorption line.
A
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Suppose you see a photo showing Jupiter half in sunlight and half in shadow (i.e., a first-quarter Jupiter). This photo might have been taken by
A) the Keck telescope, on Mauna Kea, Hawaii. B) the Arecibo radio telescope in Puerto Rico. C) the Hubble Space Telescope (which orbits Earth). D) the Juno spacecraft that is orbiting Jupiter.
At an instant when a particle of mass 50 g has an acceleration of 80 m/s2 in the positive x direction, a 75-g particle has an acceleration of 40 m/s2 in the positive y direction. What is the magnitude of the acceleration of the center of mass of this two-particle system at this instant?
A. 60 m/s2 B. 56 m/s2 C. 40 m/s2 D. 50 m/s2 E. 46 m/s2
What do "kiloton" and "megaton" refer to?
a. explosive yields of nuclear weapons b. kiloton means 1000 tons of TNT c. megaton means one million tons of TNT d. all of the above
Point charges of equal magnitudes (25 nC) and opposite signs are placed on (diagonally) opposite corners of a 60-cm × 80-cm rectangle. If point A is the corner of this rectangle nearest the positive charge and point B is located at the intersection of the diagonals of the rectangle, determine the potential difference, VB ? VA
a. ?47 V b. +94 V c. zero d. ?94 V e. +47 V