If a hydrogen atom originally in a state with principal quantum number n is excited to state n' = 2n, then
A) its radius and binding energy will double.
B) its radius will quadruple and the binding energy will double.
C) its radius will double and the binding energy will quadruple.
D) its radius will quadruple and the binding energy will be reduced by a factor of four.
E) its radius and binding energy will quadruple.
D
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Which two processes can generate energy to help a star maintain its internal thermal pressure?
A) nuclear fission and supernova B) nuclear fusion and gravitational contraction C) nuclear fusion and supernova D) nuclear fusion and nuclear fission
A 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A horizontal force of 32 N is exerted on the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor
How hard do the two boxes push against each other? A) 12 N B) 20 N C) 24 N D) 32 N E) 0 N
Consider two different rods. The greatest thermal conductivity will be in the rod with
a. electrons that are freer to move from atom to atom. b. the greater specific heat. c. the greater cross-sectional area. d. the greater length.
The energy difference between the upper and lower levels in a certain laser is 1.9593 eV. What is the wavelength of the light emitted by the laser?