A 440-nm spectral line is produced by a transition from an excited state to the ground state. The natural line width of the spectral line is 0.020 pm
The average time the atom spends in the excited state is closest to which of the following? ( h = 1.055 × 10-34 J ? s = 6.59 × 10-16 eV ? s)
A) 5 × 10-6 s B) 5 × 10-8 s C) 5 × 10-10 s D) 5 × 10-9 s E) 5 × 10-7 s
D
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If an object feels cold to the touch, the only statement that you can make that must be correct is that
a. the object has a smaller coefficient of thermal conductivity than your hand. b. the volume of the object will increase while it is in contact with your hand. c. the object contains less thermal energy than your hand. d. the object is at a lower temperature than your hand. e. the object cannot be a liquid.
A child is riding a merry-go-round that is turning at 7.18 rpm. If the child is standing 4.65 m from the center of the merry-go-round, how fast is the child moving?
A) 5.64 m/s B) 3.50 m/s C) 0.556 m/s D) 1.75 m/s E) 1.80 m/s
Power: The power factor of an ac RL circuit with a 100-? resistor and a certain inductor is 0.60. What is the impedance of the circuit?
A. 170 ? B. 85 ? C. 340 ? D. 100 ? E. 60 ?
A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?
A) The heavy object, because it has greater kinetic energy. B) The light object, because it has smaller kinetic energy. C) The lightweight object, because it weighs less. D) The heavy object, because it weighs more. E) They both slide to the same height.