The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels. If an electron at level 1 in a hydrogen atom absorbs 10.2 eV of energy, it moves to level 2. What typically happens next?
A) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy.
B) The electron jumps to level 3 as soon as it absorbs any additional energy.
C) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy.
D) A different electron drops into level 1 because it is now unoccupied.
A) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy.
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A spaceship, traveling at 0.100c away from a stationary space platform, launches a secondary rocket towards the station, with a speed of 0.560c relative to the spaceship. What is the speed of the secondary rocket relative to the space platform?
A) 0.460c B) 0.487c C) 0.492c D) 0.660c
When photon absorption occurs in a hydrogen
atom, the principal quantum number of the electron must a) decrease. b) remain the same. c) increase. d) become identical to that of a ground state electron. •
?An object is placed a distance y0=?2f in front of a concave mirror of focal length f that is located at y = 0. An identical object is placed a distance ?y'0 = ?2f in front of a convex mirror of focal length?f that is located at y' = 0. The difference between the two image positions, yi ? y'i, is
A. ?f /2. B. ?f. C. ?4f /3. D. ?2f. E. ?8?f? /3.
Suppose that two quantities, A and B, have different dimensions. Determine which of the following arithmetic operations could be physically meaningful
(i) A + B (ii) A/B (iii) B - A (iv) AB
1.(iv) only 2.(ii) only 3.(i) and (iii) 4.(ii) and (iv)