In an electrically neutral atom the number of protons in the nucleus is equal to the number of
A) electrons that surround the nucleus.
B) neutrons in the nucleus.
C) both of these
D) none of the above
Answer: A
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Three resistors of resistances 4.0 ?, 6.0 ?, and 10 ? are connected in parallel. If this combination is now connected in series with an ideal 12-V battery and a 2.0-? resistor, what is the current through the 10-? resistor?
A) 0.59 A B) 2.7 A C) 11 A D) 16 A
Energy Levels: Determine the energy of the most energetic x-ray you can get from an electron transition in a heavy atom having 93 protons.
A. 118 keV B. 0.865 eV C. 164 MeV D. 5.19 × 107 eV
According to general relativity, how is time affected by gravity?
A) Time runs slower in places where gravity is stronger. B) Time runs faster in places where gravity is stronger. C) Time is stopped in places where gravity is strong. D) Time is not affected by gravity.
The potential energy of a spring is 0.25 J when it is compressed 0.04 m to the left of its equilibrium position. This is its leftmost position. What is its kinetic energy when it returns to the equilibrium point?
A. zero B. -0.3 J and moving to the left C. 0.3 J and moving to the right D. 0.3 J and at rest